Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a2775d2c565bfd…

MALICIOUS

PDF

80.9 KB Created: 2020-11-11 17:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1699b9971cbbe770b9326966bc59bf47 SHA-1: 7b2b0a02ccd599114240a05d8cc66282bd8873b3 SHA-256: 31a2775d2c565bfd3061396814fad54e7fcc3e711b72c1649d219e212c70eccd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://traffnew.ru/strik?utm_term=probleme+dayal%25C4%25B1+%25C3%25B6%25C4%259Frenme+senaryo+%25C3%25B6rnekleri', suggests a lure related to learning scenarios. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://traffnew.ru/strik?utm_term=probleme+dayal%25C4%25B1+%25C3%25B6%25C4%259Frenme+senaryo+%25C3%25B6rnekleri
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/gipijepaborakon.pdf
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/d5bb721851c6.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8a2758dfd8e.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f9e3cceceeb1.pdf
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5f9915843df30.pdf
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fa84e481dfce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5ecc1c4-99ba-409f-8b1a-071781d08988/dragon_ball_dokkan_battle_mod_apk_global.pdf
    • https://s3.amazonaws.com/henghuili-files2/18182299830.pdf
    • https://s3.amazonaws.com/fejatepudopito/zodeg.pdf
    • https://s3.amazonaws.com/xabalaru/lg_lfc21776st_refrigerator_manual.pdf
    • https://uploads.strikinglycdn.com/files/867dc818-8e31-465c-a192-b30487bc327e/devepi.pdf
    • https://s3.amazonaws.com/lukepepe/88281857343.pdf
    • https://s3.amazonaws.com/dukajevo/an_inspector_calls_key_quotes_gcse.pdf
    • https://uploads.strikinglycdn.com/files/ec111a26-c6c7-4f91-b796-6b98b4b81b3c/87874489345.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_off0000fac5.bin
5ebd271e7bc65b323c7fefaec2aeac48c219bd595cd7ec229d30520f0adce5e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 5680 bytes
font_01_sfnt_off00010dca.bin
f25c38abccd63d43b2322b0c177c2db49651158051ab49ec36faff5a32af24d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 12428 bytes