Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b91d578039842a6…

MALICIOUS

PDF

72.6 KB Created: 2021-05-15 13:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 141efb94090af9edc8dd84fc63e84505 SHA-1: 3c816560014768982a5683db269eae32853b5e47 SHA-256: 0b91d578039842a6e92d49921123290f82f9edce62f2440f9db4e9b53d942d54
124 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to 'baarspo.ru', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9546

Heuristics 4

  • 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 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
  • 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://baarspo.ru/wb?keyword=honda%20generator%20for%20sale%20ontario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422908/normal_60430f6ed1393.pdfIn PDF document text
    • http://politach.com/kimeburenuvonivov30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_601b982d6dff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_605007359b86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_606c7c91857e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_600968cfeaecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6009f11185696.pdfIn PDF document text
    • http://bedating.online/rawinuru2jdis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_602cd9363ac0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_6037facd32d22.pdfIn PDF document text
    • http://dfwshootersupply.com/research_design_creswellwhyla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6031ae3a83dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fd8e47eec191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fc67e32169c7.pdfIn PDF document text
    • http://love-your-lips.online/kinuvinitidifupakivofozabhezaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_604c9dd575d41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/refivudomuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/dejorifekutowimewitom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808a820d-eced-4a66-a824-5564310c4d6a/66936415726.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/6285658696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c121a9d-67d8-4534-914e-30385aaaa098/95557787993.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 5036 bytes
SHA-256: c33d43817aad69f9a93fea44eafbd0df72bf261113c82605d60cd89a069b8985

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