Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fec34c3e80bc554…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 18:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 18b103ea39a3b5702ceab4ee8ae746cc SHA-1: 9ffa1c14ca2d60c8d4a09ac615fee35e04ac817a SHA-256: 6fec34c3e80bc5546691e8f4df05faeaffebdbc5e998d1ceef8b61469eaa31d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a seed-phrase/secret-recovery lure. 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 0.9997

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/strik?utm_term=2007+chevy+silverado+repair+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/sadopore/rjchihj/kodiak_cakes_muffins_pumpkin.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/bieMhcf/home_design_my_dream_garden_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fc713c22bfe9.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/17fd24d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8740f4a936.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/gfgiRib/gigaset_answer_machine_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fdbe66e61c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_6012ccec31a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6049c538ab6e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_6024958e3084d.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/tjdicE9/sipofejotile.pdfIn PDF document text
    • http://kelijoninofi.22web.org/72898635148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fdfd3181c04a.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/2e7b0fa0c4f5c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5fd276ec0375a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokamaluxofom.epizy.com/anita_blake_micah.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/facebook_cover_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/35461720531.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/mevaliredibuz.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/taborejesofopokinujelimo.pdfIn PDF document text
    • http://mezajuwobit.rf.gd/ge_profile_dishwasher_leaking_from_bottom.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_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 5816 bytes
SHA-256: 5acd3bbf9eda08fbcda653e92cded5c3e3cb0127cd8d9525e3f2552069dbc504
font_01_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 10936 bytes
SHA-256: f1f36794a3b5072019d3df842763523e26802ef636167cfbe49b808509f1d4fe

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