Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd6f30b7bbc0836…

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 22:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca656ad67d0929a639a7bfe2044ffd01 SHA-1: 2df2e779c1fcf3c779828f635f6aeedb5a87ab5b SHA-256: 8cd6f30b7bbc0836dc6534146fcc356aea2d71fd24d42e4a8ec9aaed4dc631ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to redirect users, and numerous unknown URLs were extracted, supporting this. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and the link farm behavior strongly suggest it's used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dunakeszi.varosom.hu/userfiles/files/82020466666.pdf In PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/51515761928.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/foxufukevesenutamu.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/18433999632.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/sokakanin.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/40702344760.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/risidasadijuvakipixadawa.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/puletutidabasuragiva.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ca7416d83---segelizaxugumabasuve.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/lalavimokilovodi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/29418818322.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/33993845224.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/jijezepeziwapavegiw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a71a7764af0b0946451d399212bc1a3c/jivazobenapat.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/31616251217.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/87093209371.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/22943171349.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/sonakibepazubosotovul.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/3418303069.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jesusigavibe.pdfIn PDF document text
    • https://jagominum.com/contents/files/1380248973.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/94531662134.pdfIn PDF document text
    • http://zae.me/datafiles/file/88107049453.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/dukojowosuvirurigabizit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=there+was+a+country+achebePDF 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18372 bytes
SHA-256: 72b7bb07311322e91a294890af110fc3fcf771dc663144959137b15b16d09514
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 10592 bytes
SHA-256: 46482f284944f770307dc00155106647f3a252ada0779f377654d6fcf3197804