Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6513416d857a90…

MALICIOUS

PDF

82.0 KB Created: 2021-05-19 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a30481b4b8c17d27619a541ab82ae174 SHA-1: df6edbf8446c0d5cf9ce706e04a1a5e660141093 SHA-256: ce6513416d857a903ec25199ed131da95ff336d01c847c0fcacfe1176fbda6f4
194 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of multiple external links and the heuristic findings point towards a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=zombie+shooter+2+hack+apk PDF link annotation
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/xuziro-lakegoxedup-vajuwifuwepe.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/4102243.pdfIn PDF document text
    • http://pugaxosojusi.22web.org/20069696570.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/6096588.pdfIn PDF document text
    • http://masanakepatarar.iblogger.org/xutusoses.pdfIn PDF document text
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/4647bc.pdfIn PDF document text
    • http://vejexoxidinu.iblogger.org/tipos_de_cateter_venoso_periferico.pdfIn 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://vuxikujare.epizy.com/download_aptitude_test_papers_with_answers.pdfIn PDF document text
    • http://gevorewububew.epizy.com/phone_call_recording_app_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/16659803854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1aa107-a5cf-4d95-b2d1-050e885f0680/47243854875.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/husqvarna_automower_manual_315x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b1d205-5f16-4736-a4f1-75b5671e7b17/beats_solo_3_wireless_gold_special_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be8dec3-d196-4a11-b0ed-af1c59f041e8/39473527960.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/48363723312.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/32160762672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88258d0b-c008-4a90-9122-17944ede8c7e/does_walmart_sell_top_care_products.pdfIn PDF document text
    • http://retelikejajego.rf.gd/85249435019.pdfIn PDF document text
    • http://nubejapowij.epizy.com/iron_man_1_imdb_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bf5972-dc76-4c41-aed2-90a6c601cc72/new_tax_laws_for_2020_dependents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bfd335-be79-4043-994b-384770eb4091/xojegodixaderipene.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 5116 bytes
SHA-256: 9a8cf924f72a96f5750c2ff2c0076a46d73f7376e99978b0ab54bf4a9fa60505
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 11348 bytes
SHA-256: 152354871da7cf4ec762608fa91940bdfd1ceeb6502da522229a839e7352a7af
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e