Malicious PDF — malware analysis report

Static analysis result for SHA-256 1664fec84b615817…

MALICIOUS

PDF

93.5 KB Created: 2021-09-10 02:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 986d395a103ccdabe360d8b15b9fb918 SHA-1: 07ba1609055cce5c5d6a8fd9af8957d945da398c SHA-256: 1664fec84b615817f4efc0dd687d10cf17509b04ccd6a17670de8a7cae66a34a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to distinct, disposable hosts, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://editionsitaliques.com/userfiles/file/32468274731.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/48184760047.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613088f6c9243---zudugoxir.pdfIn PDF document text
    • http://tecksco.com/upload/files/48630096918.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/13734361404.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/46598552928.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bapazu.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/51984543578.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kosepijusibozokopal.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210910010749.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/keribifonin.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/lalavafeberalog.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dezelo.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/41242713915.pdfIn PDF document text
    • http://schubert-hh.de/image/file/napavetuxutunubavasurufux.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pulonosibudivujutaja.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/fexiw.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/93261870178.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fidimumedipelumepovi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161343c74e40a7---16085277202.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/56898417887.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gotisuba.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/vumodoserena.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/37017762005.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/bawibefebotusewule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=smartphone+android+sans+compte+googlePDF 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_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11036 bytes
SHA-256: 4ac3c1a5915eb114b29acad266fc43988e74143a546f3da3bfb7a4761c6ac389
font_01_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 18376 bytes
SHA-256: 7b4db434fc90f86f6edd175d314c49c465f9331bf1fc6b1f0aaf97efdb7efa53