Malicious PDF — malware analysis report

Static analysis result for SHA-256 31760e42d1452aba…

MALICIOUS

PDF

76.8 KB Created: 2021-02-13 08:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 66013f477b61b613e7aeeaab3459d5c0 SHA-1: 21030f8819095a1a46702b69e3ab5f6dd96a8868 SHA-256: 31760e42d1452aba47d8375cb2c9390c6f984ad656334823f3bdf1b73fa58eb0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs points towards an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/123?utm_term=premiere+pro+2019 PDF link annotation
    • https://mibivatoroxup.weebly.com/uploads/1/3/4/7/134762409/1451086.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/ij3jjZL/hop_step_sing_kimamani_summer_vacation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5febf43def06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5feaf0bbe2f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/f04jbig/basidabora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_6008a26206302.pdfIn PDF document text
    • http://kesawalaxok.iblogger.org/flakiness_index_test_lab_report_discussion.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/avatar_2009_full_movie_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5fe4e6ce98c02.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ehgczzs/stickman_run_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/jdhgLhf/exodus_meaning_in_bible.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6014914fc9c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fe60e30e6f59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jogakedom.epizy.com/15399160159.pdfIn PDF document text
    • http://tikasasuzof.epizy.com/79981085732.pdfIn PDF document text
    • http://likijanima.epizy.com/jinaligokipinajipabejasi.pdfIn PDF document text
    • http://wumimed.rf.gd/dexebumu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB36 17464 bytes
SHA-256: 468cca1ddecded94810a06adbde422ae9f1f817e52c7d640a2d86e7194bc2965
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 5028 bytes
SHA-256: 3d5ddcd6650e0fd1d76642a1715432ed3441d7f6a1cf78540dcfcb07560fc534
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10068 bytes
SHA-256: 033672dfd8c561003e284c7c41fc544debff1a1767f68a50e0aef01193368c55

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