Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13d51a1cd60e13…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 21:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5887237f16d1db7755f51a1adae1f1b7 SHA-1: 62d4f230ed656f7b6a53dfe4b146dfb0ed2c0754 SHA-256: 4a13d51a1cd60e13574b86e760ce0c96392502c3fd49ae0654176cc41cc7eb08
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=rank+the+states+on+the+basis+of+the+pressure+of+the+gas+sample+at+each+state PDF link annotation
    • http://anbieterbewertung-autoscoutch.com/american_rag_shorts_size_chartjtiqe.pdfIn PDF document text
    • http://flathead.us/discuss_the_history_of_science_education_in_nigeria_till_dateypem8.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/l9Kjehh/23051850485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6033de3c5e338.pdfIn PDF document text
    • http://hookup157.fun/biohacking_sleepugor7.pdfIn PDF document text
    • http://ozalupa.space/how_to_make_simple_syrup_with_demerara_sugarb6u60.pdfIn PDF document text
    • http://wssummer.space/legend_of_drizzt_adventure_book2xyac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5feaf2ff91275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fe7c3d10720b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_6006f6738a047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403954/normal_5ff55c2bb321d.pdfIn PDF document text
    • http://detonic-ufficiale.website/spider_man_2099_comic_19927ad1p.pdfIn PDF document text
    • http://com-signto5.xyz/revajabikidokagorebuu3v3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boligasenupe.rf.gd/terekubosifowipop.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_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 5640 bytes
SHA-256: bbcb0d84100559ca9a73fd3d3678590b4caf7fcf2af91e2dacd4c627b1ae2776
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 12584 bytes
SHA-256: b19a9451948c1b546fa80354ba7ec80a5bf7cee172c35b3ce3728f525c5f397f

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