Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad71be854932301e…

MALICIOUS

PDF

80.6 KB Created: 2021-10-06 09:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ad2ae04c1bb91b6675a2f08bd26888f SHA-1: 292d18910ce1cd11c3c774fc66e49f3714bd3bf7 SHA-256: ad71be854932301ecbfbbde5850b830dc8a1c2004bfd157faad706c137647df8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to disposable hosting, suggesting an attempt to obscure the final malicious destination. The PDF structure and embedded content, though heavily obfuscated, do not contain executable scripts but rather serve as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://agarimo.com/archivos/archivos/gixoxizif.pdf In PDF document text
    • http://otohyundaidanang.com/uploads/image/files/kopifatawokunafiwewa.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fiwebijavodetapawaj.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/50204920486.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/gasopafamuxiweburusam.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/fidajedabe.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/badesegusuki.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/sobixudogit.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wesubopedumirapifovubuj.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fakufa.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/midaririwanalimurewa.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/norate.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/zisagojis.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/87538961435.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/59685499807.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/44709575240.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/32495962796.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/tomufubujepik.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/61206779829.pdfIn PDF document text
    • http://edeins.com/userfiles/file/66575164173.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/55515999494.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210928182126857663onccm.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/tadononebofasa.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xasonikij.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/repuwib.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/65595767494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eucharist+sacrament+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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10592 bytes
SHA-256: 00bcbcaae9690332b59784853f51779e80f4e95457e62897e6aa03021e5f819b
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 18360 bytes
SHA-256: 39da7ffb9eb388d9a3c9ed4a8507a91764e16eef8b51b89192df0198777a53f9