Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c219b3fdfa5961d…

MALICIOUS

PDF

63.6 KB Created: 2021-01-08 06:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 96cacf423000f9f6751121f00c86dc72 SHA-1: d9831b501b46f0c527b40562d58e94040789911e SHA-256: 8c219b3fdfa5961d2cf2ff6ca3fa0deac3cb78c0d86242c6e6a4b17f8240c636
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one pointing to 'traffnew.ru', suggesting a phishing or link-farming attack. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely designed to redirect users to various malicious sites. No scripts were extracted, but the presence of numerous external links strongly suggests a malicious intent to lead users to compromised or malicious content.

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
  • 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.
  • 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://traffnew.ru/123?utm_term=example+of+multi+step+income+statement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5fc186f67a46c.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/dazivojipetolejuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fdf962875086.pdfIn PDF document text
    • https://ridulajevu.weebly.com/uploads/1/3/4/3/134352946/5e997.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/fizamugek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fde72f003d58.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/2479ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8a456ae9c31.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/94f3ea22d47.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2657230.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/8651555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5f98332d80c00.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/wobujexowemaz_nixabiwine_sanikisu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 5092 bytes
SHA-256: 8b2f466f342fd6b0017b4f2355b14753b56efa74096935d7c3bb991fb3b104d2
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 9712 bytes
SHA-256: 2c927ac8c9890d49445a97ad61296a2531d537cbd4939133f325081687d99f29

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