Malicious PDF — malware analysis report

Static analysis result for SHA-256 34638313a2060074…

MALICIOUS

PDF

66.2 KB Created: 2020-11-13 15:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 995f965b8d75f5b10ac6393d9717365b SHA-1: 23743df1f5ed2b534d86253ac0412f9e469ec34f SHA-256: 34638313a20600747c5025a9e3636a11718158c040cc5c95af8cb51fa43d7614
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on link farms, suggesting a SEO poisoning or phishing campaign. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=pdf+periodic+table+black+and+white PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f9b011a29afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8ffc50940c3.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/gejakutal.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/276b90.pdfIn PDF document text
    • https://xavupavise.weebly.com/uploads/1/3/4/5/134584264/wegadojomoleborunopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5fae1db8c4c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8b774a6ec67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5fa8ec59588d8.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.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/gorajikunobixi/in_congress_what_is_strike_the_last_word.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_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 5360 bytes
SHA-256: 8c81278fb97c617386f342000b66fd64b8cca615b89ed9283b407ec844df365b
font_01_sfnt_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 10244 bytes
SHA-256: 635aab01de9c2d7b80fd9730517124fa8d7fc58a393e9f150229c5fd34a9e9c6

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