Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2354e76679f3510…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 03:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: faab7f0402e5231cc2fbe6232ca3b693 SHA-1: 200bd02635cd065289dc3cb5aad6bf4b6ca63112 SHA-256: c2354e76679f35107973542e79fe731c739dfe22f47dddbb88fc5ad0657f8391
196 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 benign documents, but one key URL, 'https://bologen.ru/123?utm_term=b+e+full+form', is identified as a redirector for phishing. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK', suggesting the document's purpose is to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=b+e+full+form PDF link annotation
    • https://cdn.sqhk.co/xaselavub/ilInjcp/annexed_paper_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/AjbRGha/13859115575.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/gigdUm4/83055125503.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/tevomenil/vakizar.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/datasheet_arduino_mega_2650.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/15846220077.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_a317e1cb124947539df5d1686e9cd205.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_db57554b329640af9aecfa4e3a666029.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e6d9ae-1627-462a-aefd-74c0681c2b27/academic_writing_skills_cambridge.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/gurubodudam.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/81280090243.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/cisco_umbrella_investigate_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/gititefadigasuzitodumewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bae0c87-0050-4232-8fe7-a9d67ca24147/vobazinenakajodutugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc73df23-e22f-4393-a201-e1b4e0fbb966/dulutenolupegamujoxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26448ee1-aa37-4813-a352-2d8d9540b575/32726191552.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/56514229934.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/turos.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/delta_band_saw_28-203.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/bhavesh_joshi_movie_hub.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 4576 bytes
SHA-256: 82b940a8576888cf9076e6346e7599f0d31a891c9a5e49d8942a507473e67f83
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10672 bytes
SHA-256: 2f5f1f036abc72fb9305f638a8dc2aa7a1b9843f494df225c596d6927ea8bf43

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