Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c391719d6d20bb…

MALICIOUS

PDF

75.9 KB Created: 2021-02-04 02:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d836521486aa87f00e25cb6e2f61169d SHA-1: e6a4a64b2c95fa6175660b35e045a820b36e5c94 SHA-256: 00c391719d6d20bb54c2f7ef319f06525cfd5a6375a2fb308df34322383b9665
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing or tracking mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically.

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 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://leonvi.ru/123?utm_term=candy+mountain+charlie+meme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fc6773440a66.pdfIn PDF document text
    • http://wovewor.iblogger.org/97387984281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff1af85b98e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/JjiCqhb/13232645357.pdfIn PDF document text
    • http://lirelejavebot.iblogger.org/mimilabukabelasukedetelun.pdfIn PDF document text
    • http://legiontry.online/southern_nevada_food_handlers_card_answersl0sid.pdfIn PDF document text
    • http://autobuff.xyz/96251595604cvzdu.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/387469205733n0dl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5fd82461dcda0.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/81293753407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mixomexazuvoxod.rf.gd/pvc_glue_msds_sheet.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/go_web_scraping_quick_start_guide.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/72262495807.pdfIn PDF document text
    • http://vevisadoko.epizy.com/26622817169.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 5008 bytes
SHA-256: 0545b103187ba6189add2b39cbb770091bb045e0623a8e7a2dad36aa807d07f5
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 11180 bytes
SHA-256: 59f13c0c547206b3eebaf13bca93dabc06baa05ce056b70b7dd4bc91a0c44b3a

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