Malicious PDF — malware analysis report

Static analysis result for SHA-256 a857253eb46eae3c…

MALICIOUS

PDF

121.7 KB Created: 2020-11-11 14:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32fc237f65c4994999fd017facffec08 SHA-1: c3b141ba61a36759961f7f355f78238bd3e11f27 SHA-256: a857253eb46eae3c956c76f898af0b14229d78904e0067b8886284d674153e67
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a redirector link, specifically identified as a lure for free downloads or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL, https://trafffi.ru/aws?utm_term=science+topics+for+4th+graders, is the primary indicator of compromise, likely leading to a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=science+topics+for+4th+graders PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5fa210694ca1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f9d85902a95a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f9a187194c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5f9752d65b402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5f9f12fe7c3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5f95af734633d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_5fa6c07f03a27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f8ce1ab28e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f9722ad0ff44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8ab43a4c4d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76320af1-d6b9-4e97-8011-4e53c9586ae1/nexewamirixiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a535d3-7936-4ec3-a6f5-67f843e117ac/10464923402.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/corporate_communication_effective_techniques_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/jk_dana_30_front_axle_truss_kit.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_off0001a013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A013 5576 bytes
SHA-256: 5dbbc01f600378a120bd168cf626b7d57f716077c6edacc429448200031ee573
font_01_sfnt_off0001b30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B30E 11516 bytes
SHA-256: 7bfbac6fad8b89dd84e6d89455c4cec176f06e9b4353a96ad3cfe38dec6b36ec

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