Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b3774c5dfe5fa9…

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 15:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ec431dc3dba0dc956a2e39f99e06e9f SHA-1: b05e0dfebcbcb0c4c6a7c2a0a9da3d1d6c524eee SHA-256: a8b3774c5dfe5fa93c4ffc062474ac874077dc974268cbcfeb56078ac6f692e5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=get+out+full+movie PDF link annotation
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/77068567955.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/fetot.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9cb9b068---kabubifuderudogusilupi.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vapubuvevulijixukutobis.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pekugaruwiridu.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/lifesorebajuzexiziz.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/sozixowaxezuvuvososu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/94570928274.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091805220737.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/soxewomixiluta.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rixoxawu.pdfIn PDF document text
    • https://31app.com/userfiles/file/baredabube.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/limuwug.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/30275527045.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/52161080890.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/99578911885.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dowoxaxipipobiliwas.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/34509487248.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210919_202008.pdfIn PDF document text
    • https://pkbae.rs/files/46936591303.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/13217018632.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0cdbd7f8c---67948455960.pdfPDF link annotation
    • http://christschoolblr.in/userfiles/file/76177011633.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0aa79561---97336863309.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sirugawozeletujeretuzilo.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/86421536166.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://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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 10048 bytes
SHA-256: 4594c59c65d8944551a1726ac6b95c9e8cad79a3795ffbfc4d70765a08b20348
font_01_sfnt_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16812 bytes
SHA-256: 959616eb166c497b344550c3e30a3b32f36444e7d92f7885f4f60bcee4f9d627