Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5a6414daa20269…

MALICIOUS

PDF

81.3 KB Created: 2021-05-28 23:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a2d526e117d45063100ea875c835ec4 SHA-1: 3e716382cf1d88882cdb2c89ca196ad63fdd2f8e SHA-256: aa5a6414daa20269293be044c1ef630ae711c65ec951672a3c5f1d3e7bf17608
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a PDF SEO link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'bill of lading', aligning with the heuristic findings of external URI usage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://maypoin.ru/123?utm_term=formato+del+bill+of+lading PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445338/normal_604efc3b53210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_601674c32659b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_60121696e981c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_604753fa66639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fdeb2304b1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fe744c315e65.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/kawesoriv.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/raxadoj.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/5151953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_6000551f8d879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5ffce0a687073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_6049396a651bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_5ff3bac8b6949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_6057cc67daf64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_603e5d340e352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_60589b98a1c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_60171c6d5a967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_605b4518a3a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ff064fd5f6ca.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/611e9ddb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc94fd91e68c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fe72829c8151.pdfIn PDF document text
    • https://vapukikavo.weebly.com/uploads/1/3/4/8/134886740/depipem_xutuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601b18381dd57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 5144 bytes
SHA-256: a6d8ba28990c5dce65cfd17d7316f3f10a8e47827eb5a61a4cbf57a0674aae4c
font_01_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 12040 bytes
SHA-256: 25d425c5a3dd41afb4f7c1f945c3078d4e516aecd5347886b27e765516c9d9d9

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