Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2861b1fd7ad5c7…

MALICIOUS

PDF

69.8 KB Created: 2020-11-27 16:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89775fab9bfc7dee344ad606f5ada5be SHA-1: 587eacd56713ac62bfbc231f361015c1d37ea5c4 SHA-256: 6a2861b1fd7ad5c7ed30b44da6170bab8ef09d96ea428778a45f1448f19487eb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and numerous URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=unit+4+worksheet+2
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5f986e577aed9.pdf
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/tagodukaniziregizov.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f9212edeee11.pdf
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/3817046.pdf
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/9804480.pdf
    • https://judemitipiru.weebly.com/uploads/1/3/4/3/134388438/1877956.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/1911408.pdf
    • https://cdn-cms.f-static.net/uploads/4408482/normal_5f9a10816dec5.pdf
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/c3bb23995.pdf
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/denokotezedewetuki.pdf
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/zejupigedimutax.pdf
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/vunol-dufepojobigal-xipoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d5a1.bin
522cf0b8fb7898722790645265cf7f98f93af85026f54a037b49bbf6ed23094d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 4896 bytes
font_01_sfnt_off0000e664.bin
ab72ef938875ada1efdbd2aad546353d632ac523f5962d2b2e41d6552cebec98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 10748 bytes

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