Malicious PDF — malware analysis report

Static analysis result for SHA-256 af80b96cecf328d6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 07:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: babc2113be20ea4fff3e591b118f5f76 SHA-1: ac7d7a4703af25c661b37a4877a66764d1b21e7b SHA-256: af80b96cecf328d64bfc0747bfddd43bff6fbbf0514c85eacbeddf8dedb1d0fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://coretry.ru/uplcv?utm_term=survival+games+android+free PDF link annotation
    • https://danfort.lv/userfiles/file/72778737191.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c00a7a5e98---95011377365.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/57927136147.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/tosupipetodawuguwuse.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/riwumimolozupiwirazif.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/pazusolireb.pdfIn PDF document text
    • http://lizhechem.com/upload/files/kesakaxalanesetidex.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wevurufidisilejuvase.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/68465750221.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80181728196.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/50641652796.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/netevijajaradozivozinuwe.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/69835534825.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/tojetefewexalaxivimib.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/94527250024.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/20524408802.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4063e6f56---60250310505.pdfIn PDF document text
    • https://aneri12.eu/res/file/37487647405.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/95870871197.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/28239475911.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/14443964116.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/89944433615.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/zuforonutizorenadekeja.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/gelafovaxosikefevuwi.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/kenigibadiragi.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/razadajulibojutekofufa.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/farivinaxinemijevumi.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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 10840 bytes
SHA-256: 8b94bae7abb2b134307a4cf3048419911898b68c7b30d6a2717b0775c42b259f
font_01_sfnt_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 16804 bytes
SHA-256: f90d8ed7270de8a68ccaf583d1b383faa49fa160442ebc7ac473b1a0e585a6cd
font_02_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1