Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c9e41704915c02…

MALICIOUS

PDF

112.6 KB Created: 2021-03-25 14:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a5f570b66ec7bb27f324fa6a518a94dd SHA-1: d9b4d58e8f391e405cc59d22ce29a5a057d91ad1 SHA-256: a4c9e41704915c02c55fbaca5b26161b52e967a4ea56efb3b822e5edbc9bb567
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, containing numerous external links, many of which point to disposable hosting or are used for SEO manipulation. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=bleacher+report+packers+aaron+rodgers PDF link annotation
    • http://craftsmansmetics.com/audible_free_bookdq15m.pdfIn PDF document text
    • http://bachanalytics.com/exercices_corrigs_sur_les_acides_alpha_aminspsui2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fe2b873615b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5fc649fb69f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_603a553fbe0a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fec939e47b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_605c27a496a2f.pdfIn PDF document text
    • http://20970907.net/schwinn_220_recumbent_bike_priceyoyw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_60280cd03a10f.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/368c2.pdfIn PDF document text
    • http://mattelipsticks.site/how_to_connect_a_speaker_to_the_tvekf98.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/6107745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5fd9bc39da35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601baeeb61445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_e51ae60580c64b3aa4b0d334d4621537.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04d75f2-5667-4a82-84a8-8f00d4bb0da0/wugixobefitelivumubesi.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_66ca563428f548e4ba72804b2d3123c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0550100-5026-4114-9639-273578cbb292/how_to_get_your_nj_real_estate_license_online.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_off0001765c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765C 5448 bytes
SHA-256: 888d3e85bf6e326850d1d68f18b7621170871006d2d92a77a94d8077d3b4fc72
font_01_sfnt_off000188dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188DD 13400 bytes
SHA-256: 571cac9ecf9295eab35d151d215aca17fbf53a5f3dfdd1cd6cf125c63f9b2ce4

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