Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dcdcb2b843bb73…

MALICIOUS

PDF

97.0 KB Created: 2020-11-14 00:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94d3335924ccf838dc82f1b0fb411c62 SHA-1: 1247c7506b081895819c604335997bdb4e2cf4f5 SHA-256: e3dcdcb2b843bb73cb6d686add40ef88bdb1fb6dac93ce86565079f2d213805e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggests a link farm or redirection mechanism designed to distribute further payloads or conduct phishing. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=define+bovine+spongiform+encephalopathy
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/fafoxogazevema.pdf
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fa219fdc34ed.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5fa0609a5023f.pdf
    • https://vurazomuloja.weebly.com/uploads/1/3/4/3/134322302/zoropip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/89999919758.pdf
    • https://s3.amazonaws.com/farezelof/farfesh_mosalsalat_turkish.pdf
    • https://uploads.strikinglycdn.com/files/1af16ffe-d7c8-4cd6-9cf2-42ddacc46b76/haruspex_titan_quest.pdf
    • https://s3.amazonaws.com/mefadedosuw/zegodaponozijukorowuse.pdf
    • https://s3.amazonaws.com/doxifuba/xenagojeliduwe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c9a.bin
8950ffcfe5cdb9c64b76993238a6c9cce99b33898857ad8ed105e8f40f58e5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 5728 bytes
font_01_sfnt_off0001500f.bin
641e44846ceaefd3b9ac58eed3a04a8aff957e304efa10b125b910e55a18dd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1500F 11636 bytes

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