Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dd20563d672793…

MALICIOUS

PDF

107.2 KB Created: 2021-04-01 14:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 95fa71e0fa010a06efd0ead20683345b SHA-1: f39a6b20c92e482b3d9d3766072f4c440aa87112 SHA-256: 71dd20563d6727932883780e4e8c24b4fdd89d56f6d444875038942f641c1194
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The presence of a 'download' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' indicate a malicious intent to trick users into downloading further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/award?keyword=spoken+english+book+pdf+download PDF link annotation
    • http://rinobozawizuvew.iblogger.org/74104257165.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/what_is_an_example_of_distance_and_displacement.pdfIn PDF document text
    • http://tuwuviji.iblogger.org/oc_character_sheet_commission.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/zifatuxoje.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/99370364514.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/gikilateweteropeforiko.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/american_gods_season_1_episode_1_trailer.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://sarutufasiko.atwebpages.com/ditelow.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_a456f89a3c834cb1aef65ab0dfcf4afe.pdf?index=trueIn PDF document text
    • http://xobeminal.atwebpages.com/bupemorewemo.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_4dfb18ceb51940d7a93cbb712e17ce75.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_7d8dda18b2b64566a1065ebda4f26ee7.pdf?index=trueIn PDF document text
    • http://pebodupa.rf.gd/tamil_album_songs_video_hd_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e034190-d23b-4546-9ab4-5030f2d5cf6f/pitifit.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_3477b6bc48984d39a7a4d1b522957141.pdf?index=trueIn PDF document text
    • http://mifotabelimudon.myartsonline.com/english_speaking_topics_with_answers.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/48194460569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee22e86e-f211-4b60-87ec-2eb1a2b59d81/54594944049.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_cc01c0603a924580bc5dbe7e5c05aa0e.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_9a43c9c332874c35ab01d3e731ada331.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/80695788894.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_db02215b6e8d40d7a31b488b72470c44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8651ac99-ae1b-4b84-9df3-12b9ebd77bdc/pujexogagufiden.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_49bc7452b456442b8d2cc7695c406cca.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 1696 bytes
SHA-256: 0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 5316 bytes
SHA-256: 4748c407757db0eab85ad02f87ac31cbcc8bae2db2501c628094d844a7864190
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_03_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 11516 bytes
SHA-256: 56125851d28ae4d919ea251117b8eab8816d48c91d64ac967f0dd35aad741664
font_04_sfnt_off00015f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F54 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_05_sfnt_off00016d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D55 15556 bytes
SHA-256: f1f88f951b778a6705b92bb876c460341fd90f6194d3f9161fe810b2d7e6200e