Malicious PDF — malware analysis report

Static analysis result for SHA-256 6113b67e8ef759ee…

MALICIOUS

PDF

83.8 KB Created: 2021-02-12 14:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bc69d84a4fc661b97bcbb93390a4910e SHA-1: d6d12835987255ef0af151a2cb0581742ed94c13 SHA-256: 6113b67e8ef759ee6ac2a0e390a5f6ee10a7e170d062249ff8e255b4b2c61a23
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=voluntary+response+sample+article PDF link annotation
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/a2027b3f521f31.pdfIn PDF document text
    • https://bunekapizo.weebly.com/uploads/1/3/0/9/130969144/fimivin-lowowanov-zokewiriv-medolegokeg.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/lijhbT6/counter_terrorism_defined.pdfIn PDF document text
    • http://fb-ig-copyright.com/26330461874kory7.pdfIn PDF document text
    • https://cdn.sqhk.co/kesufetumo/ajc5nge/55860992079.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/7ghih5h/square_stool_painting_ideas.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/kipuxerurabi.pdfIn PDF document text
    • https://cdn.sqhk.co/goxoxasopus/EAgjghh/54887061066.pdfIn PDF document text
    • http://liketsven.xyz/71154311409rv57x.pdfIn PDF document text
    • http://velesvoyage.ru/foam_sheet_art_projects1n6z9.pdfIn PDF document text
    • http://domsale.xyz/57257504721uujvh.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/hbLiegj/sijisojazel.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/2581619.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/ofedvia/74058823595.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/whb9fib/kung_fury_street_rage_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagapari.rf.gd/88948999573.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/pirates_of_the_caribbean_theme_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/49207956876.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/65481977550.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_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 5148 bytes
SHA-256: b748b3892a3397489f5a71dd3554b02a151c9f274b781b23a8f6eb7492a288fa
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10700 bytes
SHA-256: 91687ebab884974aaeccbe37e23bf8094e23a5a2a17b04a757bd05f5233168bd

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