Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb64ddfdb4edf57…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 04:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c9a386923a4569c520cabb2f3a0486 SHA-1: 79af3336cd55d651281c28a499b2d81b82e04d9c SHA-256: 5fb64ddfdb4edf576d592cf2b89c331ffedc7bfc830042e96a7bdb0cb44a645d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm of 22 external URLs, with the primary suspicious URL being https://pelibifir.ru/123. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it's designed to redirect users to potentially harmful content or facilitate SEO abuse. The document body contains garbled text, indicating it is not intended for direct user consumption but rather as a container for malicious links.

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://pelibifir.ru/123?utm_term=isha+kriya+online+guided+meditation
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601662ec6c524.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_603382a7a4365.pdf
    • https://cdn.sqhk.co/bilanogakiw/gi9ggpl/bezawowakonasadatidid.pdf
    • https://cdn.sqhk.co/gituridewo/jiiadge/coffin_nails_ombre_color.pdf
    • https://cdn.sqhk.co/wuvupalib/gUggzig/fanesemakamufixim.pdf
    • https://cdn.sqhk.co/xipuzotekela/h9F6QkI/pilot_freight_services_glen_mills_pa.pdf
    • https://cdn.sqhk.co/xovikojux/vhahjgc/fruits_and_vegetables_quiz_questions.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/7994762.pdf
    • https://cdn.sqhk.co/jeforije/DMiegdY/6132431542.pdf
    • https://cdn.sqhk.co/guzorata/jfhhjhE/bullet_train_driving_simulator_game_download.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fe686e73b4db.pdf
    • https://cdn.sqhk.co/dawajimet/ejhJicc/rifaketemopujawudafilig.pdf
    • https://cdn.sqhk.co/wekaradukuve/icFhggi/hashtags_for_instagram_facebook_twitter_linkedin_logo.pdf
    • https://cdn.sqhk.co/medugagoviji/eOiegiS/bet_dynamo_free_trial.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_602c182ca7e51.pdf
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/gevujexaruxobefuka.pdf
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5ff39129d8116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xasobanezifo.rf.gd/image_formation_by_convex_lens_wikipedia.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_e45351a1052f4de6860dc439c14a6717.pdf?index=true
    • http://jeronegiwok.rf.gd/java_8_offline_installer_64_bit.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_74890d8b74c04cb296a0e3999f4f88f3.pdf?index=true
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_3550afa1da2447009616b20f395d7d61.pdf?index=true
    • 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_off0000f648.bin
0fe40dd547967ba1eb3d169929f6c173186535dddbded632c52d05d6cbc69c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 5344 bytes
font_01_sfnt_off00010851.bin
d8fb5d3f61a5019b6f1901fef0c10077b4769fba98970e9996f38b0c11f6a54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 10396 bytes

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