Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dd8da2d762b2a6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-09 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233c2540d997a3f0777a5570575c1eac SHA-1: 9163c7cf04a770ada3e79aa629f1889ac65eef28 SHA-256: d2dd8da2d762b2a65cbedfc611ba144ee01ff545acfa39e69077905d11e997be
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 links. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URL 'https://dafemum.ru/strik?utm_term=erreur+connexion+psn+ps4+ce-33992-6' is likely the primary malicious destination, while the link farm suggests a broader distribution or SEO poisoning tactic.

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://dafemum.ru/strik?utm_term=erreur+connexion+psn+ps4+ce-33992-6
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600c63f50da57.pdf
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5fc9c04ef0817.pdf
    • https://cdn-cms.f-static.net/uploads/4417205/normal_602b93a192376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tozuduxaxikagik.rf.gd/etiologi_cephalgia.pdf
    • https://uploads.strikinglycdn.com/files/b46f8c2b-687d-4cd9-bdaf-96e5fdfc0c89/kedubasegutifuvape.pdf
    • https://s3.amazonaws.com/desekusoxi/jabekipuwuzotuzupezowin.pdf
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_ca27ada5853e42668c29b5f8c0807083.pdf?index=true
    • https://s3.amazonaws.com/jukezeluf/42162618444.pdf
    • https://s3.amazonaws.com/woxotopapozokev/fanatuxud.pdf
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_d73e9429705c4b65be8c474b7add2d17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ef49efc4-7ec6-4e8b-a564-c75af390a35f/33525589468.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_110db192a0a54c8ebe7487f32097d0d7.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_d31a33c9d5c3438dabea9607f7275ac8.pdf?index=true
    • http://ridoxomozip.rf.gd/pedamexivumumobedekizam.pdf
    • https://uploads.strikinglycdn.com/files/0d8850ab-3efb-4141-88b2-4a325be714b7/stihl_fs_46_parts.pdf
    • https://uploads.strikinglycdn.com/files/abb2bde6-a8c5-4419-aafe-8c9ba8291bb9/89981392708.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_b70fb699804a492b99f79b5ae76baeb8.pdf?index=true
    • https://c1191828-cc20-429c-ab85-47df0b5b5cc9.filesusr.com/ugd/bf07b1_51ae8a30828b43ffb0ec162fbff07b8e.pdf?index=true
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_0eb8888929c542979568c77fc8cd8070.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_off0000eb87.bin
c868d7ebee0c67a58dcbe85f6449e3c5d50ac0e28d8bcbf962693a62279ce063		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5436 bytes
font_01_sfnt_off0000fe23.bin
61c352768a9a2f3e661896a152c4bb0d762f1b8696f1305ba04e68bc4dfd2492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 12040 bytes

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