Malicious PDF — malware analysis report

Static analysis result for SHA-256 028f5f7900efd452…

MALICIOUS

PDF

67.6 KB Created: 2020-11-24 19:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: abac95172f78789505b708c9880206d3 SHA-1: 65f4ff3b381ab26439c17349cea99b11d54e65f0 SHA-256: 028f5f7900efd452c99d19d5ca75f06d30383ea81ac953a82589c3860d60e27b
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. 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 0.9998

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://trafffe.ru/123?utm_term=milky+bar+kid+lyrics PDF link annotation
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/kibixuwizeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_5fbc94a1b953e.pdfIn PDF document text
    • https://kimumowo.weebly.com/uploads/1/3/4/4/134480515/2773464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fa3131a457f3.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/mejosos.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/talose-zegazetodatik-xajotejatuduk-manejerewikemat.pdfIn PDF document text
    • https://rosojuvawava.weebly.com/uploads/1/3/4/7/134719385/5f210149455457d.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/04b1f.pdfIn PDF document text
    • https://vokefuda.weebly.com/uploads/1/3/4/7/134709273/fobidusod-rawarisof-pojozavuluw-novalupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f95f45b73256.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/pefuwejem.pdfIn PDF document text
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/nalaba-dajaxumaneko-viniwuvefuf-wekevadagemato.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/477c3af4540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c5e32e-520f-49e6-bec5-26f37d113332/xonuleru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ed70d8-6f21-4ad1-b33f-17f66aa3a393/saneriripaduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ca5ba8-fc72-4800-98a6-2e211db1d7ec/lodomixupabekevol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba037ca-ff87-4db4-95c5-5d4f13cded59/kuxefemaxekututuzobabixu.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_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 5244 bytes
SHA-256: 2d732af5c9291fb7cf62adfe3f1eb661b25ceb3bdf8d0d7b4b0c23fa9160cf5f
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 11208 bytes
SHA-256: b4ca612b43f79abd3655d772d32cc897bb7f31746b9af838b1669f711fbcaf38

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