Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6759973daf46c0…

MALICIOUS

PDF

66.0 KB Created: 2020-11-11 13:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a07b34e13af60bef31e965ace489d2c SHA-1: 1dc86916bd287d86794310e8fcc3a7ef84a57568 SHA-256: bb6759973daf46c0b019afac9c6ba4be8a6120a43bd56ba259644d30494966e4
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and contains what appears to be metadata from wkhtmltopdf, but no clear instructions or lures are discernible from the readable text. No scripts were extracted from this sample.

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://gettraff.ru/strik?keyword=asus+vh236h+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5faa29afdce0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5f9d32e96d404.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/1617326.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/7607131.pdfIn PDF document text
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/7666566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f9f2aff5fc80.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/2826810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f87675e476db.pdfIn PDF document text
    • https://saxigixerugeri.weebly.com/uploads/1/3/4/5/134585582/3726662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8a98bed98b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5f8f6cffacfd8.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/8689268.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/medadele/october_sky_movie_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/zuvatogepuzedinorowuwe.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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 5328 bytes
SHA-256: ccffa384ef7d9366c41dbdd8855d2a0db934480cd14ac8189c0a4508d276ec3e
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 9568 bytes
SHA-256: c8379e5fb5ba82d4b9e53dec6adcea4b20737cc6808afc28146fccea1f0d886e

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