Malicious PDF — malware analysis report

Static analysis result for SHA-256 467db31540692f4b…

MALICIOUS

PDF

79.4 KB Created: 2021-10-07 17:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f98975a801d6fc43805c1f8ee68dbb3c SHA-1: 5bdadc2c33c8a1620c5ef44230d7b86a5238fdcf SHA-256: 467db31540692f4b1b762daac26a0ebf7fdfd2b42a1e24b7d8c10a0e3bdc089c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, indicating a likely phishing or malware distribution scheme. The PDF's structure and the presence of many external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=breuilly+nationalism+and+the+state+pdf PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ceaf82ddbb---53378123586.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/giloxig.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/totetoje.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/nukewakidiragoza.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/roravezuzozuwisisut.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/didabisakusabino.pdfIn PDF document text
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/tukoxibavufatozoteput.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/60723264487.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zetufarowokitajimupudafi.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kojozedeninawexoranetebub.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/1991836397.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/19162400190.pdfIn PDF document text
    • http://pachinkoevent.com/sites/default/files/file/lepiwozagipitaworipib.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210924121740.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/50068685893.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/voretelir.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/kojumifejox.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/wajajibajagenubiko.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/tarajemulasexakevakufa.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10433656688.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sudoturegokamepajese.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/rexanafo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xazobafejotitifine.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/20506292522.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/88717177218.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_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 11028 bytes
SHA-256: df6abdf0b6ab5fd25200c1c47804e701c4ad515d193bac18f427459541cadae4
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 19500 bytes
SHA-256: 089fe158183c970a46647cff891a31474eabd8c6d7becdf44b723f2370cf0f50
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1