Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d9f31e886eb7fb…

MALICIOUS

PDF

78.0 KB Created: 2021-04-22 23:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078a2685f9b57df5db56e7790652bfb1 SHA-1: 736e0378e15a239b9e8ae3a33d09fcaeff550ec9 SHA-256: b2d9f31e886eb7fb5b3181315d02d8f2500c66ca17058d84f2415fb11161737d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'ponafet.ru', which is identified as an external URI and part of a link farm. The PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=kenmore+dryer+belt+repair+kit
    • https://cdn.sqhk.co/pelebitebi/widujjb/drive_and_park.pdf
    • http://fadulifakibul.medianewsonline.com/akinetic_rigid_syndrome.pdf
    • http://megaliwuxo.22web.org/diagnostico_definicin.pdf
    • https://cdn-cms.f-static.net/uploads/4371240/normal_6020849bbcc48.pdf
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fee3d138db20.pdf
    • https://cdn-cms.f-static.net/uploads/4386081/normal_602f5e86c32b2.pdf
    • https://cdn.sqhk.co/rureroso/KqIUjhH/97888657617.pdf
    • https://cdn.sqhk.co/viforoge/CrQjfsO/water_parks_in_orlando_florida_aquatica.pdf
    • http://mojofaza.mypressonline.com/ordem_siphonaptera.pdf
    • https://cdn.sqhk.co/fogobewataja/CJebgj0/shooter_lube_negative_reviews.pdf
    • http://duwinijuj.mypressonline.com/74859444231.pdf
    • http://ferabugajefelam.mypressonline.com/anesthetic_machine.pdf
    • http://lulelege.iblogger.org/40014827064.pdf
    • https://cdn.sqhk.co/molodomo/ibbqTih/last_cloudia_tier_list_global.pdf
    • http://zinefikitozozeg.sportsontheweb.net/how_to_estimate_the_price_of_building_a_house.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/padanivozeb/zuvuxupuse.pdf
    • http://rekulino.epizy.com/nigerian_airforce_aptitude_test_past_questions_and_answers.pdf
    • http://fotafufoka.epizy.com/formel_for_areal_af_cirkel.pdf
    • http://mebebopolimo.rf.gd/public_finance_notes_kenya.pdf
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_e61667183f5e401686a3aed8e7c9a5fb.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_54fcead1a60b49bca070eecd135875f8.pdf?index=true
    • https://s3.amazonaws.com/wewuxuviwar/jewamepovujanopa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e637.bin
1a0296b28c92e9c294ea230d9d218e180f923e46a5e0d664216d1ea2570ba778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 4988 bytes
font_01_sfnt_off0000f70d.bin
e55ce7e304dea702019d419bb0b348cb8832ba8b15286978ec0edc1d2818ade3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10952 bytes
font_02_sfnt_off00011c62.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 4324 bytes

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