Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c1d2e973ec7f2f…

MALICIOUS

PDF

65.6 KB Created: 2020-11-29 02:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c9763870b82cc49b2f332e630f0f1533 SHA-1: 2b942729adc3ecdd08deb3097a378a0a9a67f74f SHA-256: f7c1d2e973ec7f2fad2cde4bd9634b0a829373906413f78be70b56928b2cc09e
156 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 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://trafftec.ru/aws?utm_term=animated+infographics+ppt+free PDF link annotation
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/5425837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fa69eb1553f2.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/vidoxumajarani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fb2622411688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5fbc6d4218d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f9ece52cd13b.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/bepukuba/lorraine_lea_premium_percale_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/butcher_block_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/3750916769.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/aap_guidelines_introduction_of_solids.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/50273807383.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_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 5528 bytes
SHA-256: c7a29951a9af49fe8b3363829f5fcf2871698df294b0977fbda479a8065be061
font_01_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 10292 bytes
SHA-256: aa19c4013e7e83f785d6a8f2292259e840c1e5970cc3dfb35c4110d702e8794a

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