Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3cb259734aed7e…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 18:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 865886bc67a546246bec9204f1f912c4 SHA-1: 09f3bbf8f804d88eb7ed5bdf6fbc939aa798933f SHA-256: af3cb259734aed7e910e9c35836671acdc09c75e570513578e368334d8b4f304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the ML classification indicate a high likelihood of malicious activity, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://datatalk.ilvzhou.com/upload/files/2021/10/202110011838058750.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/gemoxaxejebali.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/65525902979.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/wopabajoxesuwaxeworobagop.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20211002_F09826A90FD09672.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/41395979137.pdfIn PDF document text
    • http://olympusflights.com/files/files/39666632552.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/75913426775.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/pevepijumusijupigox.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/72973947754.pdfIn PDF document text
    • http://signauction.net/userfiles/file/66507844393.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/tiravemezefogodeka.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/zigawikigaxivafosamosi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/77068793068.pdfIn PDF document text
    • http://www.polni.si/Images/files/pedefojibog.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/21924957194.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/felalisopib.pdfIn PDF document text
    • http://jinyezi.cn/upload/71312560441.pdfIn PDF document text
    • http://space-edge.com/upload/files/vowoxagixatupebogetix.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/30679394828.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/51680312280.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/62140796735.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413d84474b8---35126374302.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xexanoxefibemimefib.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6l3ac7skf6d1ifg42qjgd0l2ju/99292051283.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/47750390325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=3+lines+meaningPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 15956 bytes
SHA-256: 50061330eccef337fb011bab07e2f7c121dc5a62484481cb4089acd046a92ff9
font_01_sfnt_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 10208 bytes
SHA-256: 5e839f0d265f0fabc38d2590fb10c81c8bd37cac6660f9e779bd7def2a5c22da
font_02_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1