Malicious PDF — malware analysis report

Static analysis result for SHA-256 d251b420b5d8ea03…

MALICIOUS

PDF

101.8 KB Created: 2021-10-08 06:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cf254a56d5b326626f58b3d13f202406 SHA-1: ed2355fd3a77c42be3a35934f17240ebce2136df SHA-256: d251b420b5d8ea032e90e3871ebf5a9f8f62b2257d05b23cedb0b686daef09fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://crewmak.ru/uplcv?utm_term=immersion+baptism+meaning PDF link annotation
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mitixuwasevax.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/miwusipob.pdfIn PDF document text
    • http://zenhowell.com/upload/file/rigedujelewupikujiw.pdfIn PDF document text
    • http://chinahongji.com/d/files/zikuzo.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/51704436994.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/bajagigi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/59376496964.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/wunologamivufuxosir.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/nisufogojegisotuzefutox.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/18629970430.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/19256380921.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/4896014980.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/jinikonok.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/gobenapakotarorikabumuko.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/2738509785.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/38582009332.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f216ab237---wutixovuf.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/9572590304.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/49228556534.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/45250552038.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/30377695427.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_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 21624 bytes
SHA-256: 345e3ab217ba1ba674e517b7f4dbf4b13fabf26a8e7eddab6ebd22968ec29468
font_01_sfnt_off0001597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597E 10640 bytes
SHA-256: f184cacb136cdced219ee243768f70dce53c3fd838ed13decd057592555eead8
font_02_sfnt_off0001719f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1719F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1