Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aeab429160bc028…

MALICIOUS

PDF

74.4 KB Created: 2021-01-08 04:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6ac627ddd436faaec8cbf2bb23ec70 SHA-1: e90e8c2f2eb743fa83c9d85da79d7caa2e9261b8 SHA-256: 2aeab429160bc028dc1d4e4d6b8772bfd256060572c42b915074f01d2908b967
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the numerous external links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=formation+of+the+solar+system+worksheet+answer+key
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/fitegolav_takexewelab.pdf
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/34e40c430.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd296fbecd2f.pdf
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/3840565.pdf
    • https://cdn.sqhk.co/fazovivum/bhjjgUG/786250011.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/dff7ffa46571d3.pdf
    • https://cdn-cms.f-static.net/uploads/4490273/normal_5fdb014c74013.pdf
    • https://davijoxo.weebly.com/uploads/1/3/4/3/134357566/derit.pdf
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/venamajimaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20cc1f84-eab4-4e60-89cc-8e8486248ae3/71507804727.pdf
    • https://uploads.strikinglycdn.com/files/fdcfa562-9c9d-4d8c-9bce-dd796eb6e41a/tugimeli.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_off0000e649.bin
842e872ee4d6baf2c12f16bb9e179951157393bb1bb7545a42120402c08dd041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5220 bytes
font_01_sfnt_off0000f7f5.bin
072e357f82da05744393a85d3f080f5a32c75e55df2eb8b4233c6bc50d3449dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10656 bytes

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