Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d841a4d91cb9f6…

MALICIOUS

PDF

66.3 KB Created: 2020-12-20 12:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6ac145a84ce73245712d20df57df79fc SHA-1: bc65c96745e3b6c7fa439931ff3bbba7c35d3442 SHA-256: 45d841a4d91cb9f6fa7cab2243a0a14c90ea8b39dede4af01f25bba7b043a7b9
156 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffnew.ru/strik?utm_term=tul+pen+refills+pink', which is likely used to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=tul+pen+refills+pink PDF link annotation
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/rexutajaxojubas_jafali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fbb61c8c741314323605/t/5fc394c9e18c5c478e69cc07/1606653130006/pederes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ccaa239b07229152d4e0/t/5fc89b2fb0f45b2a3d29acc3/1606982452364/romibe.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/71127560133.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/88536534549.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/ajooba_full_movie_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/sitton_spelling_4th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/14611187287.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/taeyang_eyes_nose_lips_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/surah_al_kahf_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/49511763129.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54ceba13a450bab11859f/t/5fc64a289d79364840631d27/1606830633593/download_car_parking_multiplayer_mod_apk_hack.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 4700 bytes
SHA-256: efd640866bc5ed049a62fd14b8865b9715ef22864e56245237c7c8dd0a440fa8
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 10780 bytes
SHA-256: 07a825790dcffd84504dabcb46cfea0eda505c4553b41770efefa1468d3a68ce

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