Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd5fc805b26dec2…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 23:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffbe928d95959f4c9e83de10612adcc9 SHA-1: c60f3d8f1b404b116c340212c61e068cc87fcf35 SHA-256: 6dd5fc805b26dec2aee4361ea9be8a9097d1162c5683430c7ce261675f2e9c39
186 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. 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 0.9960

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=braun+series+7+guide PDF link annotation
    • https://cdn.sqhk.co/zidenesek/OjigISw/58643483377.pdfIn PDF document text
    • https://gediwidamavuluv.weebly.com/uploads/1/3/5/3/135348022/puvof_xibatibur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_604e277e044c8.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/mifeEgj/13837802697.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/57UhdUk/super_9_sniper_rifle.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/rudupirozudukajemul.pdfIn PDF document text
    • https://cdn.sqhk.co/dobusalebed/mjdiatb/votudiwejazilujuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_60220b3aa6195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601b7e232c7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_603d879d09131.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/Ajh6Oij/animals_printable_worksheets.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/3492861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_604f42a760ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_603946b2d1ee1.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/956dd5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5fedd81d3d73b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_b22173353ff24b73a5ee60a89436c30c.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_1f83dca0fc704bc4a8440e92d05eeade.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_45e7657ae9954ad7a7da5edb479fa59c.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_72c6e7a30c4146ca9fc0f771b679880f.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_cd9510965045433a822f5c1b3833ad0f.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_cbe8a63af2e84e54981c51b61fe3e0e8.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_a7a229d663504701813b01a99f585dd5.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_09f7d5e9b70e4e5e8383969b0c4c3f38.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_77e8c834c41e46a1ae6a6facbb407e38.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_b741a026ae43402793fc3047993ad03a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5092 bytes
SHA-256: 4ea76419ea053c30192fca27d52bf4304bf0824d1f73d2bf06a620ae1901eff9
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 11236 bytes
SHA-256: 9a2227bec9e26437f57dd39f23def400cce1421f00e7488677368f17ee339d88