Malicious PDF — malware analysis report

Static analysis result for SHA-256 b268e938785c8bed…

MALICIOUS

PDF

62.9 KB Created: 2020-12-17 17:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 62b5268b5be2d37a150d1598636dd170 SHA-1: 12f8636101a362d497fb5ed861e3f6c2910ad743 SHA-256: b268e938785c8bed79419435e00fe41a23b6d937488eb5f8c9290453f6aadd90
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 flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=linear+algebra+friedberg+4th+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f9449646d6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_5fbcf45aa2aed.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/4453655.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/nalevomuzex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_5fab7fba31167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fa2525092e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5f9bec7c36b2c.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/ganop-zubekuf-zezesonet.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/4361770.pdfIn PDF document text
    • https://dojigatat.weebly.com/uploads/1/3/4/5/134586133/169486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rowubunak/adjectif_franais_arabe.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/68891692961.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/betokatafigageki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147cffcd-9019-49e1-8e9f-5e81e5f45eeb/25253592433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c51ccb-1905-40b2-81bf-09002f67ee24/33601975423.pdfIn 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_off0000b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95C 5296 bytes
SHA-256: 0e55df57aeb5e2228bc558e7af89973ba904694b82c694261d709f1022187230
font_01_sfnt_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 10328 bytes
SHA-256: a5e923ca159681c2520fcc7f6989e84a426e3d8779ae3a7d17aa3e0fc8852f78

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