Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ab3cbf70e5ad79…

MALICIOUS

PDF

80.0 KB Created: 2021-03-11 06:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f6f9d834be03b1b70e5888df6429fa SHA-1: 16c9334550601b5ba61601622478d3e148d860d7 SHA-256: f4ab3cbf70e5ad79a03a18b248dc085a3d784652b8e716228de731fc11d0888d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'dafemum.ru/award?keyword=radiographic+cephalometry+pdf', suggesting a lure to a malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farming are indicative of malicious activity, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=radiographic+cephalometry+pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/mikewot.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/0e6ce56567c6.pdf
    • http://najapizarut.22web.org/caldera_spas_pure_comfort_manual.pdf
    • https://cdn.sqhk.co/nomuzali/PHSgjgi/bonnotte_de_noirmoutier_potatoes.pdf
    • https://cdn.sqhk.co/joxopejufito/AmjfHhi/analisis_dafo_segun_autores.pdf
    • https://cdn.sqhk.co/pisimebuziz/gXijSIF/99717201132.pdf
    • http://gosofejabe.iblogger.org/dadimatogezaxaw.pdf
    • https://cdn.sqhk.co/piwuzuberaze/3jfijgh/8615174766.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/4161242.pdf
    • https://cdn.sqhk.co/dejenuluzew/gcggjg9/36337773068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tawosutosuxi/zozagowu.pdf
    • https://uploads.strikinglycdn.com/files/f4607ee5-ff53-40fb-b3fd-1128538457af/what_is_the_portal_system.pdf
    • https://s3.amazonaws.com/nuselufuzo/dupanotupenon.pdf
    • https://s3.amazonaws.com/baxekojojexusol/system_subsystem_design_document_template.pdf
    • https://s3.amazonaws.com/tinivukedeta/sinonimo_de_busqueda_de_informacion.pdf
    • https://uploads.strikinglycdn.com/files/23e6710e-4903-4b2a-9a3e-819bed3ec3ba/13644099464.pdf
    • https://s3.amazonaws.com/lukepepe/indian_saree_dress_up_games.pdf
    • https://uploads.strikinglycdn.com/files/f99aaf2a-b0cc-455a-9868-e9d5cae70858/the_art_of_living_well_and_finding_happiness_cancer.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbe.bin
5169f4b85d1d4c30ff97f92f72b44b6a225d6257f71a0e01a1bb004a44cb31d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 10380 bytes
font_01_sfnt_off0000ed9a.bin
159d3a71028f0b917911887f88bf29fccc155afa1b932fa6c83783a50dbdd601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5184 bytes
font_02_sfnt_off0000ff52.bin
baccea4cbe3d240ef74b11a2ada62e8e4471c556c7ab394e4e786d1422682bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10320 bytes
font_03_sfnt_off00012265.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 4324 bytes

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