Malicious PDF — malware analysis report

Static analysis result for SHA-256 2980f8fe93c3dd7d…

MALICIOUS

PDF

84.9 KB Created: 2021-04-02 14:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c35c44a0e08d0b39bad6f98d20b7d5 SHA-1: 4204d42f4db447665d58fe26cbe30c172e545009 SHA-256: 2980f8fe93c3dd7d959d264f2c2cf74b07f511009710e2a4c9b017ee271ee09b
196 Risk Score

Malware Insights

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

The PDF contains a high number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The presence of an eval() call and ML detection further indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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://dafemum.ru/123?utm_term=decloaking+chamber+manual
    • https://cdn.sqhk.co/nubavojek/mEifSja/texas_hold_em_poker_set_rules.pdf
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/gidibapevalex-tenifivagopat-tuduzivuxapepip-gusepazunolu.pdf
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5fc999f461801.pdf
    • https://novifofogabux.weebly.com/uploads/1/3/4/3/134371065/3072707.pdf
    • https://cdn.sqhk.co/vulovosovem/gdGQjjc/widasopudimojebor.pdf
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/rinupagup.pdf
    • https://cdn.sqhk.co/ragejeli/hfjiDcp/lejibigimaxo.pdf
    • https://cdn.sqhk.co/xetokive/hbcidic/89094229119.pdf
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/7591082.pdf
    • https://cdn-cms.f-static.net/uploads/4376610/normal_5fd389bba8808.pdf
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fed505b7d017.pdf
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/9324694.pdf
    • https://static.s123-cdn-static.com/uploads/4464850/normal_5fdd34a4066b0.pdf
    • https://cdn.sqhk.co/wixumenez/iidqLjh/sarkar_infinite_game_play_online.pdf
    • https://cdn-cms.f-static.net/uploads/4427095/normal_605556af3257b.pdf
    • https://cdn-cms.f-static.net/uploads/4410416/normal_603a0a55e565d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11977f4b-704d-49bb-9715-932246e488b3/would_you_rather_questions_for_teenage_girl.pdf
    • https://uploads.strikinglycdn.com/files/41c68dbd-ad9c-4cc2-883a-4813b4db1b85/13949111107.pdf
    • https://uploads.strikinglycdn.com/files/6b1d3386-c66b-4b8f-b800-a24f94e3d812/zitifuled.pdf
    • https://uploads.strikinglycdn.com/files/2b0059d8-e469-48ce-bad0-9ec543a0a205/barbara_minto_pyramid_principle_book.pdf
    • https://uploads.strikinglycdn.com/files/630d8457-84b6-4e28-953c-08d2da12e8cd/what_is_the_portal_circulation.pdf
    • https://uploads.strikinglycdn.com/files/8472aacb-b8f9-4df4-9b2e-8067c4210dd3/larivesasobalufiworaxup.pdf
    • https://uploads.strikinglycdn.com/files/23f276f0-8588-483a-97c5-08137dec8cce/49291341098.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_off00010dc0.bin
bf142fec5b454cf6b241ce87735a5a194031cd72e0b8daae24c48c988262bb86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 5236 bytes
font_01_sfnt_off00011f6e.bin
bb7c6d4e64c1369f3532001d90b9d0b176abf7abdb25b2c9b2c0f3127a5ec1f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 11292 bytes