Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa58138a3ee96b86…

MALICIOUS

PDF

65.9 KB Created: 2020-12-03 23:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a705d8780e59d1597dbaeee9825999cb SHA-1: 762d1f7cdd0342fdd3330ec361ece3f9b880824b SHA-256: fa58138a3ee96b868dde0accdb5141902c1e96e04027635e368a44a4f743c784
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffnew.ru/123?utm_term=5e+homebrew+classes+best PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5f979bf61f318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f9aea6e5e251.pdfIn PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/xewena_gefefogu_riribetumanozej_wavopede.pdfIn PDF document text
    • https://gozibaduvixumu.weebly.com/uploads/1/3/4/6/134628844/janekigomuz.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/d36e8a4a346a.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/5835976.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/duberumelaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f89caa1c950d.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/0b86c29c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5fa464a9d83c5.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/6463617.pdfIn PDF document text
    • https://bujopovuw.weebly.com/uploads/1/3/4/3/134390204/6987726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/subud/77692274699.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/wazaxepasupuzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85E 4932 bytes
SHA-256: 69b620de60c7f6a7061796db39958fda1179878ed97e9625a2296fb57b66921e
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 10264 bytes
SHA-256: 7445a4ad453ecf7951486be1562b3b7f6405f2a96ab6c100f1034d0a22c9363e
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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