Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd70f119caacb0cf…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 02:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9fa7f8914f244b949ad5520f889883a8 SHA-1: 40fea8f056393cde3235728163d4707ab332d76b SHA-256: bd70f119caacb0cf85a0810e6c259097c150226ac7db195f6059698f763cadfd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are designed to appear as legitimate manuals, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=mod+apk+unlimited+money PDF link annotation
    • http://zijilip.iblogger.org/26131009218.pdfIn PDF document text
    • http://verification-help.com/manual_pet_bottle_filling_machinewy3lt.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/scratch_apk_for_pc.pdfIn PDF document text
    • http://stickerrus.ru/koln_concert_transcriptionua5vi.pdfIn PDF document text
    • http://crawlmqyu.space/wipomezoxeludutisolulia6h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7fd204-039e-401b-9ea0-f35e720389b4/honeywell_lynx_installation_manual.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_e2cf7a2626db4022a11b519e73a27806.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2118ef22-a046-4c8e-8442-b064861f6a5d/repabibanunudefutosineru.pdfIn PDF document text
    • http://kugilib.rf.gd/photo_album_editor_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fec1e5-bbfc-4793-98c1-fad55cd06d6e/wagner_paint_sprayer_setup.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_16b8275df90f4f44b2e5cb7965bc30c9.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_96d4d5b99f6a497ea3f1f9acd97c3a30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79287dc6-6af5-40b8-b88a-3ab994dfa3df/563606816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76d9f7d-0d94-4e7e-9a1b-cc638ece0137/bokavuzolalurazatakixigif.pdfIn PDF document text
    • http://femejuzi.epizy.com/does_total_fitness_do_nhs_discount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c0f192-08e1-4ad0-8fdb-b9fd8ca9c74b/newest_edition_of_blacks_law_dictionary.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/bleach_vs_naruto_free.pdfIn PDF document text
    • http://rolodumom.epizy.com/gluten_free_food_at_mcdonalds_canada.pdfIn PDF document text
    • http://julepudelixi.rf.gd/celtx_script_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352186fc-8e51-4880-9d95-95ba2e3107ba/tokyo_ghoul_season_3_theme_song_lyrics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 5000 bytes
SHA-256: 1b6916f8da9f0e6b5a7d00e1d17b85e26095403485910642707937e1bfeab5ff
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11080 bytes
SHA-256: 5333695f1338936b654dd5500e574f8424d4aedb9091f8cbf5d3fa6799cd14d7
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2