Malicious PDF — malware analysis report

Static analysis result for SHA-256 11928811a73b861c…

MALICIOUS

PDF

65.0 KB Created: 2020-12-22 19:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2bd3b905d601979d92fca56e58a9cd8 SHA-1: 518cc32dad32d1e0543eaedaaa0f9eabd1a6b164 SHA-256: 11928811a73b861c8321b41da98e35ac746caae856d97678c18fa6cb8533456e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/aws?utm_term=mocha+after+effects+cs6++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5fb8ccf74486e.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/4c5a770.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/futak.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/3314b6ee44e5.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/vovasijutavud.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/6499367.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/2d91f388.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/nagewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f8a3f56d9079.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/vesubodufisi/lawn_bowls_scoring_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25b5c67-3a6d-45f3-9463-6677bf0b8ba7/devuzexun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c645dbd-4d75-4a61-a697-755c5cc64473/52346606900.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/3196261587.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_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 5096 bytes
SHA-256: cc5d4def313d70ce02e17a8c4929b8d337665b9c511b236a07ccc10a4509ee2f
font_01_sfnt_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 10636 bytes
SHA-256: c1bd408d157255341c9f0a3c8dbac69d5d2950604b40f01bdbcda3ba1c33bc4a

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