Malicious PDF — malware analysis report

Static analysis result for SHA-256 1774f90c86b5618a…

MALICIOUS

PDF

67.8 KB Created: 2020-11-21 10:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4516363535826838908e9ee364b794d SHA-1: cf91b37ba0b3392e2c27758d96651710445485bd SHA-256: 1774f90c86b5618a274e1315aa47d32609c950c07ac9f6ba1bb018739475a103
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wilitixovin.weebly.com/uploads/1/3/4/3/134351513/ganamodexuzodam.pdf.
  • 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://traffine.ru/123?utm_term=four+second+frenzy+hacked PDF link annotation
    • https://wilitixovin.weebly.com/uploads/1/3/4/3/134351513/ganamodexuzodam.pdfIn PDF document text
    • https://lukizodik.weebly.com/uploads/1/3/4/4/134458766/dezex-dowalar.pdfIn PDF document text
    • https://vasegalewi.weebly.com/uploads/1/3/4/5/134595350/lovabaguso-debejovinujaz-zifufanop-kenarawagew.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/9ac50f.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/4409324.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/pobenirabexu.pdfIn PDF document text
    • https://tixasenuwafoja.weebly.com/uploads/1/3/4/6/134658158/55a20dd8.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/gezekejatelenofo.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/pojatuxononetew_tifizotubuw_puwumat.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/d54b0ccd-8167-4ce0-8ceb-d50fc98e27a5/rivuxavuzulewovufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6e205d-5209-4e97-8fd9-6d37834d1bfc/parcc_writing_rubric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b168f7-90d8-4b31-bd5f-dd7f1c4dbfb6/39714187409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25040bd3-d597-47ad-bde6-1912dc7f2b60/laminate_floor_repair_kit_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693392a7-3e49-463d-84fa-9dfd3332255c/super_mario_sunshine_game_id_gametdb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 5248 bytes
SHA-256: b3782df14ad382fa6384e5374e580e51c8f5bc6be32333c8a1e7f676018c9d06
font_01_sfnt_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 10948 bytes
SHA-256: 565de1a51e6f266dc923c1f418943b74d1c8f14e7e4bb8124454364784d458b2