Malicious PDF — malware analysis report

Static analysis result for SHA-256 7106c32dc9000498…

MALICIOUS

PDF

66.3 KB Created: 2020-12-19 07:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceac0dc7c13a5a67f65745325a83d3ee SHA-1: 145acd8b78b618f8890bac5d1a6289b572173e5a SHA-256: 7106c32dc9000498f4155f886182fc2d8857e0fb381aa23011ae6c4d1238e68c
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one primary URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=the+trading+tribe+pdf
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5fc664e9ed1dc.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fa61c0a5e05d.pdf
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fd77afeaadbd.pdf
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/4271007.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/9510429.pdf
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f9838d73f7b7.pdf
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fdd2faa78928.pdf
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fdc0c2c2cf0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b02da7d-6696-4c95-9bec-22ae192e69a1/rubbermaid_7x7_shed_parts.pdf
    • https://s3.amazonaws.com/xenavuxa/vogesezemifasebi.pdf
    • https://uploads.strikinglycdn.com/files/5b8397d0-0bd1-4123-96ca-7a27f2e1cfe3/rodiwugariwamutirumip.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_off0000c721.bin
4e2929d989fc2930523a1a483ac0e6a55a63432af6d3407f3d3b2f093ff5ab44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 5184 bytes
font_01_sfnt_off0000d8bb.bin
74b335f0078298052549b722209cccaa6592b0a68603927cbb2f9218d5bc5a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10532 bytes

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