Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9bb6d9c3165dd6…

MALICIOUS

PDF

79.0 KB Created: 2021-05-05 16:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 79696df4a990d41bfe47bb0e4613a016 SHA-1: 90707d7ec31923c596de336c0fb239db89e63c7d SHA-256: 4f9bb6d9c3165dd6ccd8933418ecafb3c502b47a12248bd1db2029fcbf99654a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for distributing malicious content or conducting phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous disposable hosting links further supports the classification as a malicious link farm.

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.
  • 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://jacksth.ru/strik?utm_term=honda+3000+generator+repair+manual PDF link annotation
    • http://salebox.shop/the_stranger_albert_camus_frenchlgeon.pdfIn PDF document text
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/624d7349c7c655.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/string_theory_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/gihifhe/vudujuzezijovipi.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/eigwejf/unsupported_spiral_staircase_santa_fe.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/igIgtg2/10871570767.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/mobilcom_debitel_vertragsbernahme.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/pivazusid.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/joxaxazu_bobewuxapu_vilokivobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff171c7616d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_6056b9ed71aaa.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/giShaBP/88210739875.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/7zr5hit/fonts_free_for_commercial_use_2019.pdfIn PDF document text
    • http://andyhongdigital.com/pp2000_citroen_downloadweafv.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/LlhcHif/xiderumak.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/ghfErsI/36796115781.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/ejbTC8a/jaxebutepata.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/bzTGlQP/happy_wheels_demo_free_play.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sipanokule.onlinewebshop.net/wuvaxorupusi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5252 bytes
SHA-256: cb35700a09666308265658aef3b657094f557a4d8627480b8ce1aaa3a2ab4814
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10896 bytes
SHA-256: a7ea3267aa6572b60f7119ba450eb0ca431fc5d9e3b1374183f1e1678adcc905
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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