Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cf3ba6fcac6613…

MALICIOUS

PDF

66.8 KB Created: 2021-01-06 16:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0669fdceac560feed9c8064a4919dfb7 SHA-1: acab964403081b11577dda02c03945620cde15f6 SHA-256: 76cf3ba6fcac6613fbfbbcef8ae8fdf28dbd34a1535c30526db69523a97aa69d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=bulk+sms+pro+apk+free In PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/luponawos_motiti.pdfIn PDF document text
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/rumiripaj.pdfIn PDF document text
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/wobad.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/Viixghe/1480395516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff507b18d246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f582293cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5fe0c1974702d.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/muvizajuzukafez-ladizivilafiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f86fed2739e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5fd98cf1adfae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87d9132d619.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/668884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fa50790734f1.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/ojbgjQs/family_farm_then_and_now_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 5160 bytes
SHA-256: 80a9c53e000a405de7c04140f586839c1d4927dcbbe8daf56b03950a3e4ca898
font_01_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 9892 bytes
SHA-256: c18c110c403bc0d81670f0663ac4319ea5886ebd5e3821272107664454be450b

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