Malicious PDF — malware analysis report

Static analysis result for SHA-256 41de6412e18cbf62…

MALICIOUS

PDF

97.3 KB Created: 2021-04-02 18:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3d96412c9faec87e8950113a12717b2 SHA-1: 716d79d9287de3fadb2ad1d84b27139462a8231e SHA-256: 41de6412e18cbf628985210b35a0849a628520175f0efe7ac6e4548606355d68
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of external links and the nature of the heuristics suggest the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=plant+genetic+engineering+pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6061f83a784bb.pdf
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6026b622a0489.pdf
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/5a688e450938963.pdf
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/kigeko_miwita.pdf
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc612f83db0b.pdf
    • https://cdn.sqhk.co/takoxuwal/bdhjYG4/sloth_in_spanish.pdf
    • http://newapegujopabi.22web.org/extreme_asphalt_car_racing_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/napefabet/7XJSgjj/guide_fall_guys_tips_tricks.pdf
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/1e8dbe7461.pdf
    • http://saxamem.iblogger.org/54315172141.pdf
    • https://cdn.sqhk.co/tobamozusaj/YdJUzhh/koxudo.pdf
    • https://zuwuloju.weebly.com/uploads/1/3/2/6/132681456/zazix.pdf
    • http://lagepukoz.22web.org/51333201301.pdf
    • https://cdn-cms.f-static.net/uploads/4379841/normal_602597f71d769.pdf
    • http://tefituguj.iblogger.org/sapijepod.pdf
    • https://cdn-cms.f-static.net/uploads/4486041/normal_601b3f1ff393e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mukexojot.rf.gd/benim_hocam_tyt_tarih_soru_bankas.pdf
    • http://kerizef.rf.gd/agile_development_download.pdf
    • http://zosotafofuzidiv.rf.gd/schlage_keypad_lock_fe595_troubleshooting.pdf
    • http://varaxekewuveza.epizy.com/zafumuwudorawakoful.pdf
    • https://uploads.strikinglycdn.com/files/4c5f04c1-308b-4f15-b8a0-6d7d160276fc/australian_business_law_book.pdf
    • https://uploads.strikinglycdn.com/files/faf3c378-a9d2-41a3-a43e-773d9e7ed85b/horse_drawing_step_by_step.pdf
    • http://roworozirad.epizy.com/redizisedajatudalep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128fb.bin
38a5b2d4c34bf7f24be96829511fef58adbbcc132cd748675ae648b6da72640d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 5148 bytes
font_01_sfnt_off00013a93.bin
1440e523c34ea7a7b87717540040b071221eefa4d1a9f0ec36ae1b4f1660c3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 11540 bytes
font_02_sfnt_off0001621d.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1621D 16204 bytes

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