Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d2091fd555f10f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-30 08:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7207e3e7e698a6ec8900f1afaeeb3bc0 SHA-1: bf3d7e3c8f94c4cb133956009ddf6441306222a3 SHA-256: b2d2091fd555f10fd48d3ab694a436127e3e5e9615f68bf6300b48af23296969
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links identified is 'https://zajinet.ru/strik?utm_term=what+are+examples+of+cognitive+problems'. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for redirecting users to malicious sites, possibly for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+are+examples+of+cognitive+problems
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/fddd6dc.pdf
    • https://cdn-cms.f-static.net/uploads/4485322/normal_601973b49887a.pdf
    • https://kozikimonewuzo.weebly.com/uploads/1/3/4/5/134592445/bemavawoti.pdf
    • https://cdn-cms.f-static.net/uploads/4455681/normal_600c03e2cdbb1.pdf
    • http://2020coupons.info/julius_caesar_act_1_scene_2_study_guiden78g1.pdf
    • http://lnstagram-helping.live/el_proceso_de_la_investigacion_cientifica_mario_tamayo_y_tamayo_5ta_edicionzrkq6.pdf
    • http://dkmz1.club/age_of_z_origins_intimacyrc0kg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/60e1225f-eef0-4c03-b93c-bf88b922f314/famous_persuasive_essays.pdf
    • https://s3.amazonaws.com/fuwawibu/fred_beckey_cascade_alpine_guide.pdf
    • https://s3.amazonaws.com/potamotaz/dandapani_meditation_guided.pdf
    • https://uploads.strikinglycdn.com/files/a9c3c826-7fff-44b3-af63-3e7085f609a9/79523784849.pdf
    • https://uploads.strikinglycdn.com/files/cfedca87-af11-4043-8ef4-946ef8e43491/tedewoputi.pdf
    • https://s3.amazonaws.com/zobuwubedak/37790866744.pdf
    • https://uploads.strikinglycdn.com/files/f87f544a-1964-4c6c-af22-7d19fcd7350a/zexureporipobamodaxogasi.pdf
    • https://uploads.strikinglycdn.com/files/9508f4c6-84b4-4128-92d2-bfae02c5bbe4/tepawizuvojodogewidumiw.pdf
    • https://s3.amazonaws.com/febopa/11401977448.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_off0000ea01.bin
6ea6002e8221d54351cd8d937e50c1ae24e03b9b8ec89009824fbe1c610bcdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 5496 bytes
font_01_sfnt_off0000fc9b.bin
ed8db30dba527141c5983a8f64a05efdaefc7e7627d69d00b767412d7177c178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10568 bytes
font_02_sfnt_off000120a1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 4324 bytes

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