Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d744e9c5e3054dc…

MALICIOUS

PDF

71.7 KB Created: 2021-06-10 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9699f1a5468720c991c1b423a0bc5159 SHA-1: 469f44aa7b804cdd5ab32bee914efd5331a95122 SHA-256: 2d744e9c5e3054dca0da0ac69855ce760c08c8b83f8511de0f91f42df0f37f81
186 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, with the primary URL pointing to a lure for 'Clash of Clans' game modifications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing malware. No scripts were extracted, but the extensive link farm suggests a mechanism for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/pbw?utm_term=clash+of+clans+real+mod+apk PDF link annotation
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/3655713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_6053e845ba778.pdfIn PDF document text
    • https://vanatajeto.weebly.com/uploads/1/3/0/7/130740174/gamovavidako.pdfIn PDF document text
    • https://xevusego.weebly.com/uploads/1/3/5/2/135295893/sutasud.pdfIn PDF document text
    • https://juvivufoli.weebly.com/uploads/1/3/5/3/135325295/2143926.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/2614055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6054b37026f2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_60ba7a3b05afd.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/e99a48185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff8801ddfeb9.pdfIn PDF document text
    • https://dulifemubal.weebly.com/uploads/1/3/1/3/131398350/7121588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458390/normal_5feb8066171c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fc8fb06d85b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_60baaf08bf5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_605b0ef7136b6.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/gaxoxuxuxedaxoj-giwis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munonoraze.pbworks.com/f/oxido_de_hierro_2_iupac.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/40823037181.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144470658/32608957341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ccb20a-62b0-46d7-966a-d5a30a5aaeb5/vetekoragawilobozud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d0028f-cdb5-4621-98af-39e45421c01a/how_to_make_debit_credit_and_balance_in_excel.pdfIn PDF document text
    • http://razevolo.pbworks.com/w/file/fetch/144779103/doxovakemegale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6311ecf-2c19-4c3a-89bb-a5902634f9fc/fabesiwopajuli.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144995526/96485144457.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5364 bytes
SHA-256: a8b621e52a652b025b327870d4eaeb1e0e29b688dd2de5974c555e55eaaefbaa
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 9644 bytes
SHA-256: 23c06ab53bdecb7ba457ad7701c18263bbc5b2d06051eb7fc064d9b2e2cdb394