Malicious PDF — malware analysis report

Static analysis result for SHA-256 b811c9277882b9a5…

MALICIOUS

PDF

78.4 KB Created: 2021-04-26 13:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1e079b0d04d679e7161841a11d85e0 SHA-1: 855a538913e6e762a095e8feb1439a87b273c995 SHA-256: b811c9277882b9a5550e539f41b191469279958ec52cd5c4bc2cbbe1afc45e46
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 a primary suspicious URL pointing to 'vilenefex.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'Volkswagen alive review', likely a pretext to drive users to the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+to+keep+your+volkswagen+alive+review
    • http://shimano-stradic.ru/bully_apk_1._0._0._18fh5hs.pdf
    • http://zisujetev.iblogger.org/feral_tiefling_lore.pdf
    • http://domavera.ru/livro_parbolas_e_ensinos_de_jesus_cairbar_schutelkg0nh.pdf
    • http://volanorirabu.22web.org/ejercicios_con_angulos_complementarios_y_suplementarios.pdf
    • http://kuguduma.iblogger.org/stanadyne_fuel_injection_pump_manual.pdf
    • http://odemebayisitrafik.com/exponential_logarithmic_functions_quiz_review_guidezfdj0.pdf
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/jixadigibilobu.pdf
    • http://firstflirts.site/fervent_by_priscilla_shirer_study_guide3fe3n.pdf
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/muwofute_regom.pdf
    • http://idslim-italia.site/national_mall_walking_maph48p9.pdf
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/xorovajikan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d756d525-7edd-44d7-a4cc-c7b0b4627b50/jofakawu.pdf
    • https://s3.amazonaws.com/varolexexus/lutatumozosapamotivij.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_c677a400db7d4a6097153dcc1819e6a9.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_5b1393e72fc0445b9ce260a4cea37c86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/651134f2-c55a-4a3d-9d7f-38fc803717db/how_to_keep_rhythm_in_golf_swing.pdf
    • https://s3.amazonaws.com/kefiperizonofu/61249264522.pdf
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_c633c68ea5a7431e8f3694a45a6e93c8.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4040c19f72dc42dc8eb3ab92b85c00b1.pdf?index=true
    • http://kupavojos.epizy.com/98226933242.pdf
    • https://uploads.strikinglycdn.com/files/d458b1c2-af2f-4f08-9e71-e5d8bacc09a8/what_is_the_best_lure_for_flathead.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40b.bin
381528a6a7d3694352f994e21a387be2fbc1bb09b5b9f7763559baa290678989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 5268 bytes
font_01_sfnt_off00010625.bin
7c42c3dfb54ae75f8f8a2a97bad51c2d8ae9f2ef9935c95181fea14d66484fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 10600 bytes

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