Malicious PDF — malware analysis report

Static analysis result for SHA-256 964b9a3fe6d8b7e7…

MALICIOUS

PDF

67.6 KB Created: 2020-11-18 21:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 866e3c7ada66c310c78aaa0c4da1e089 SHA-1: 13a47b7d5ae3da980a6e2a0eacc1459cac1ff41c SHA-256: 964b9a3fe6d8b7e7b75c83c235cda8fdcf18a5b0cadb813b93bc090562a795b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which are disposable hosting services. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=mrs+dalloway+1997+cast
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/walidewimi-fowisukuvenab-sasonenosof-tajakoxama.pdf
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/gaduniduvirev.pdf
    • https://rewazuxaroro.weebly.com/uploads/1/3/4/3/134341361/bewawi_xawalasoxale.pdf
    • https://ketawajizaw.weebly.com/uploads/1/3/4/5/134528489/1896d1.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f8b2c5063464.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f923622d2b96.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/6681df9f0.pdf
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5f908c69beb4c.pdf
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/04b00b6d5cd.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/dd11c929de.pdf
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/4565198.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/4624867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7c5340e4-1464-4e90-9dd6-c3c55f5202a7/how_to_be_sick.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_off0000c9ae.bin
3855fb74c4c8f7ccea7794becf3d81715b07bc2b11852bb23b05772927ee1099		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 5420 bytes
font_01_sfnt_off0000dc52.bin
58388d6eeb546d6e2890a1da7827ff2614ea246574eb60ce04308d356ff79fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 11200 bytes

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