Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cb78a358fd5cd5…

MALICIOUS

PDF

91.9 KB Created: 2021-02-16 13:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 426226f731aa7a62d4de42608e9b7842 SHA-1: 4234ee2a2ec8985edea1bc502d26365933350f37 SHA-256: 22cb78a358fd5cd549f966e48123dc78eaa58f17f1538d42357062c2fba8c595
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious sites, possibly for SEO manipulation or to host further malware. The primary attack vector is likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/wix?keyword=linear+factorization+theorem+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453902/normal_6029456083cca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fd08e0d7e1f7.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/dadodi_gumawisazok_sirowigumu_dukikavidub.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/highchb/dinosaur_race_car_set.pdfIn PDF document text
    • https://gumubabe.weebly.com/uploads/1/3/5/3/135302836/71b113d144bd37.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/eiaeLnb/towomupojexujixevanami.pdfIn PDF document text
    • http://masalev.ru/700026272339ih98.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/gcja9jb/14248071747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_6023dddae74cc.pdfIn PDF document text
    • http://antonioit.space/28528772184sphv1.pdfIn PDF document text
    • http://excschool.ru/67673369333c4mht.pdfIn PDF document text
    • http://fb-copyright-help-from.com/chess_board_size_for_3_inch_kingpz7bo.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/hhhaigW/morepedanosenu.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/TgdZvhh/dragon_warrior_2_nes_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_6009da73f2dbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 4936 bytes
SHA-256: 4177f2fef957181078360f7b9ed223656748ab39933cf9be1a905834806cd212
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16584 bytes
SHA-256: ed10aee6a200e77131cbbd2bf00cf3d2e755bce9535ef84fef5b83f8633922eb
font_02_sfnt_off00014c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C41 16252 bytes
SHA-256: 62362d21ebd76c6c223a6f8ad962ddb5e58ad8f1f191436fb5c92b2705a6e6b8

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