Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead433f8e9c6191…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 21:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a37de586e2f4111c01ffcfa01ed6e141 SHA-1: 9d1ac403127e2f96eba05a09d44b92b06fa69c08 SHA-256: 7ead433f8e9c619186a45c2d4cb1a7a3ef10e551263bf3b1c4afed383c9bbb17
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('vilenefex.ru'). ClamAV and ML classifiers have identified this PDF as malicious, specifically flagging it as a phishing or trojan. The presence of embedded links and the nature of the heuristics suggest this document is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=hp+scanjet+5590+scanner+specs
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/kurijexuvu_dinikutiboma_dofipupoge.pdf
    • https://cdn-cms.f-static.net/uploads/4455176/normal_600f17d746b2e.pdf
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5ffdc2c1765e4.pdf
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5febfe29f3fad.pdf
    • https://cdn-cms.f-static.net/uploads/4488566/normal_5fda80cc4a52e.pdf
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/vawesopug.pdf
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603263f00ab66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sulasatevirexo/90753563090.pdf
    • https://s3.amazonaws.com/tiduro/cambrian_period_ep_2_eng_sub.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_3f078fccaa1540b9a25e1fc1e8c8eb71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2534fc0b-80e2-4757-bb2f-0d118b9ed5b1/tekonsha_90160_primus_iq_electronic_brake_control_instructions.pdf
    • https://uploads.strikinglycdn.com/files/18c50e98-a8d5-494b-a57b-b94c69d68a56/percy_jackson_the_last_olympian_audiobook_chapter_1.pdf
    • https://s3.amazonaws.com/vawoginele/siwokurisakonuludevom.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_800f542924e6473490b7963c1acfad59.pdf?index=true
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_17679795dbc247258de7ca0195a5efe8.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_7cb8202bcc174c28b02129b2b9142428.pdf?index=true
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_713053b52001459e89fa7050695f4143.pdf?index=true
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_df0f4f8444ec4eb2b361aef7a85a8d97.pdf?index=true
    • https://s3.amazonaws.com/xipavir/ejemplo_de_memorando_llamado_de_atencion.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_off0000e268.bin
f77f551c3eba82bd6eeff75db4c30ac1b2d9ca664033cb13fb9f4fee1fa528e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 5352 bytes
font_01_sfnt_off0000f4b6.bin
50577ff1a0677d008bc48278c95abd25c43784a05e557d7cffe6ecc20136cbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 12204 bytes

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