Malicious PDF — malware analysis report

Static analysis result for SHA-256 6878d0fa31aada31…

MALICIOUS

PDF

70.7 KB Created: 2021-04-26 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e247e66a1aee517e26d0f6c4c3a3f7ca SHA-1: 584f9bbac03661f21d3999e5fbdf277984f50eae SHA-256: 6878d0fa31aada311f7dba19bfb5f9f1515338df62917b072a6996f57f7f4c29
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 of which are part of a link farm, suggesting a phishing or SEO poisoning attempt. The primary malicious URL, vilenefex.ru, is presented as a search result for a specific academic topic, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, possibly involving JavaScript for redirection or exploitation.

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://vilenefex.ru/strik?utm_term=herstein+topics+in+algebra+solutions+chapter+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369520/normal_600af58af29a3.pdfIn PDF document text
    • http://morasufas.iblogger.org/67504960464.pdfIn PDF document text
    • https://pikulevixabokof.weebly.com/uploads/1/3/1/6/131606248/9297331.pdfIn PDF document text
    • https://filajusarapobu.weebly.com/uploads/1/3/4/7/134761194/junilo_xudesebi.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/BgjbLjm/fadipapulixu.pdfIn PDF document text
    • http://guwunewuwujulat.iblogger.org/famunopipazefituvif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6009d41d1ba47.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/hcghhj9/42834311322.pdfIn PDF document text
    • https://jowomuzixife.weebly.com/uploads/1/3/4/6/134634296/8072103.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/votuweroxigezog/wivizegamak.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/87997453350.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/how_does_the_stock_market_work_simple_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/40113022287.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/bandicam_old_version.pdfIn PDF document text
    • http://jonegukum.epizy.com/wijaxinumotos.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/98642400672.pdfIn PDF document text
    • http://peworesafasar.epizy.com/80590177715.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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 5420 bytes
SHA-256: 583e69550097d0e57453f77f2dccff0b5b4e8db8807e0e4d6f09e19b3a1e3175
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 11268 bytes
SHA-256: a5439c8c1b9e24e30e82678855df95911d5dfcabc05282d21c5055bbd5621739

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