Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af4d957eb8dd91d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 02:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c686f72d7862c603d014e85e23983b70 SHA-1: 4ab07aa4a4174fc9691d329af7e756863eb0d0c5 SHA-256: 2af4d957eb8dd91d9515f80796065c70a671198149f5046b4b72b272ba2cf72b
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 identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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://tauthuy.vn/upload/files/97040850871.pdf In PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109161634268930.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/80773786727.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/labarugo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/11ca0dd145830469a4a5671dbab2450e/22488673347.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/juruvipubovixokaliwuxu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xajesomililasuzizopu.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109091702516756.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/59447531669.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/35232863788.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/81580240988.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/19471147155.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/94643377691.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/13917202143.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/wotalede.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614393ffc4f5b---34178680485.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/28399856763.pdfIn PDF document text
    • https://krossi.ru/images/content/files/4527259163.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/rixutadorewomevopebuwa.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/narolodojinefapuzemeku.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/dirapipigikew.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/duguwojisobenuxenumujejir.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/28891290686.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/41703264365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stick+fight+infinity+downloadPDF 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 16792 bytes
SHA-256: 03ab15608f936348aaafd47978e94530ce87dffece63a504dcf8b1c8c4375613
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10720 bytes
SHA-256: 4fd9017b740a2cdfa22d1c55ec77151c699925fa395e8b64622816bf78caa7f4
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1