Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6766c38106c551…

MALICIOUS

PDF

69.0 KB Created: 2020-11-18 07:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e74532f4e5e8915cd3b666913ee9af4 SHA-1: de9c0802db1de0d83c5b088164dc13c41edb8feb SHA-256: 7a6766c38106c551ffebd8dccc68d5e5f9bd283ebb0843512b333f58e95edf38
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ggtraff.ru/123?utm_term=ceiling+fan+with+heater+outdoor
    • https://xapunuzut.weebly.com/uploads/1/3/4/6/134683745/8986778.pdf
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f8879c26da00.pdf
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5fb259296539d.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f928b87aced6.pdf
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f90f148765de.pdf
    • https://cdn-cms.f-static.net/uploads/4413227/normal_5faf399bbca7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedure/pezawukawoxenedewuraninu.pdf
    • https://uploads.strikinglycdn.com/files/c3995766-a247-4c4a-b26d-37ed219dd9e1/mibigagewezozod.pdf
    • https://uploads.strikinglycdn.com/files/417f3443-01a9-4fcf-9bc8-704c42129053/97897963587.pdf
    • https://s3.amazonaws.com/wiwamoxamo/letter_template_photoshop.pdf
    • https://uploads.strikinglycdn.com/files/6afd387a-f6a1-47ab-853a-d6b0aa990493/tosovafim.pdf
    • https://uploads.strikinglycdn.com/files/2b789528-d532-4266-a4f7-891fa9a9be99/julia_serano_whipping_girl.pdf
    • https://uploads.strikinglycdn.com/files/e27a2c5c-fef1-4636-a4be-a2c5e52fc0ac/conjunctions_worksheets_free.pdf
    • https://uploads.strikinglycdn.com/files/ed309865-10dc-48a3-82e0-7368fc9874ca/sims_3_kill_mod.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_off0000d409.bin
4a28ba01108803a2a55f696ef34725343c8b275efd26fd4b87387d165f565148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 4988 bytes
font_01_sfnt_off0000e509.bin
3ad7d0ec38a071028469f67f9fa6b79b34324ec315e5ecccc7937a6ac2688013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 9940 bytes

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