Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5872c524cfb504d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 11:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df3b94e9b0906eb18c0048164c2e00c2 SHA-1: d01f5e5f5b6d74af978d14d790f996787722de5e SHA-256: b5872c524cfb504db285f0febd0711f9fd711bd5c6131dcfaab4a8a49157313a
126 Risk Score

Malware Insights

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

The 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's part of a link farm designed to redirect users, likely for phishing or malware distribution. The presence of numerous unknown reputation URLs further supports this, with http://helloslow.com/data/userfiles/files/xofuxokumajagegokuxexu.pdf being a notable example of a disposable host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://helloslow.com/data/userfiles/files/xofuxokumajagegokuxexu.pdf In PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/66560020218.pdfIn PDF document text
    • http://jljemc.com/upload/files/40158135588.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/44311026435.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/95291696784.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/78037963893.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/82010935941.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/bevojepagef.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/magakoko.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/25886870771.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/54143775768.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/mewizarovupek.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/fegivow.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidepixoluxabe.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/dowulodorigok.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/4608708630.pdfIn PDF document text
    • http://garderoba.sk/images/_file/51113608007.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xilan.pdfIn PDF document text
    • http://indel.sk/userfiles/file/18419411995.pdfIn PDF document text
    • https://sanidom.pl/img/file/birojo.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/82678586799.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/10079463002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=war+ages+legend+of+kingsPDF 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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 14868 bytes
SHA-256: 80b4661fd55d7c8dcd1127ff96b57fff52fdfdeb60293c323a0813e577363655
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10516 bytes
SHA-256: f890b597813ddb5ae1d50df4b33e77d54abf5b83ebcb7d6f7e375dd2b63e180b
font_02_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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