Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be4cb599b98f5bb…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 10:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b78de0d06165efb41ec18e55a266cda SHA-1: 2ef56666e72a0e58f2681de0c414e0f34e6a8014 SHA-256: 4be4cb599b98f5bba06021206a643304065e1ac618c2cdd70171880f97b9b99c
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded external URI pointing to 'vilenefex.ru', which is likely part of a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=kitchenaid+stand+mixer+colours
    • https://cdn.sqhk.co/tumozaraf/F4ygjVU/savupewisakisiwetep.pdf
    • https://cdn.sqhk.co/bevurokakug/jhf5he7/freeze_your_credit_for_free.pdf
    • https://cdn.sqhk.co/podogule/f4hgibT/honda_cb_shine_sp_photo.pdf
    • http://bestrongbyg.com/96989838129ljlur.pdf
    • http://magic-spring.com/lefuzoturao9k6e.pdf
    • https://cdn-cms.f-static.net/uploads/4487413/normal_60118a0ee786c.pdf
    • http://uose.xyz/74084286580v9qcm.pdf
    • https://cdn.sqhk.co/jabisopomuxo/aPNiaih/34359791254.pdf
    • https://cdn.sqhk.co/xexerekija/idghgFh/wedding_cake_toppers_michaels.pdf
    • http://petersikdar.com/cdma_full_form_in_managementy61en.pdf
    • https://cdn.sqhk.co/dukosisevu/48ibhal/961841306.pdf
    • https://cdn-cms.f-static.net/uploads/4454052/normal_60180b307b355.pdf
    • https://cdn.sqhk.co/jumivosokigo/Whgheih/hampton_beach_nh_surf_report.pdf
    • https://cdn-cms.f-static.net/uploads/4454999/normal_604e2cbb1561f.pdf
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fdbb7eb30abc.pdf
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5ff4b869da4b3.pdf
    • https://cdn.sqhk.co/risevejuxik/jjiaijw/arya_full_movie_in_telugu.pdf
    • https://cdn.sqhk.co/pivifilogopa/g0aigpe/wizard_of_oz_characters_cartoon.pdf
    • https://cdn.sqhk.co/xanikadir/fghsnia/13779192884.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5f.bin
8482349ac7eb3afeeba555f6265835ad4c4df3cb138e42ca737fa71d81208fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 5216 bytes
font_01_sfnt_off00010ff7.bin
fadb3ab1f14d7e05a127df39f59a7c7f6763dfd4d5fb723dbc8136574cc27768
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 11352 bytes