Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c40d0febb2698e…

MALICIOUS

PDF

85.0 KB Created: 2021-02-22 23:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f33490d74562ca8a9a58d6e0922d7596 SHA-1: c4568100d36f6a361990e400d97b830fc678e2f0 SHA-256: 27c40d0febb2698e54dc756d2dcac12d2185c0b21d65185117819a406b8f1d6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it is part of a link farm designed for disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely attempting to redirect the user to a compromised site for further 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 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://seumenha.ru/123?utm_term=if+my+hot+water+heater+is+leaking PDF link annotation
    • http://rijupoxog.22web.org/avatar_full_movie_telugu_lo_ing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fe33ce2f317f.pdfIn PDF document text
    • http://jezituwevusefaf.iblogger.org/general_chemistry_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5fc9fc0257fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_600f9801e7cbb.pdfIn PDF document text
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/1474311.pdfIn PDF document text
    • http://itchia.space/photo_background_remover_pro_apk2wdbc.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/8982136.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/tosinojawuxojuziwad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373769/normal_6000b80e74712.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/dinilederu/vupigobevofuruwufelasigoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/bounce_dryer_sheets_sds_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/radobejegaz.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/63998303171.pdfIn PDF document text
    • http://juzatapanosuwi.rf.gd/3519087339.pdfIn PDF document text
    • http://nupifikitove.epizy.com/ronuzob.pdfIn PDF document text
    • http://kajonamopesubom.rf.gd/analytical_method_development_hplc.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_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 5376 bytes
SHA-256: 05fea928c562866dd437addb28987199d35a4d9ea90acd284ce45f66a390294d
font_01_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 11368 bytes
SHA-256: 0d50ae071f0773dbbac8028254b4a0f4626988f6f92c624b847d92a137d26782

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