Malicious PDF — malware analysis report

Static analysis result for SHA-256 9111a33c53584d94…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 18:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acc546d7d1c1b71320af56d3a74fe9fa SHA-1: 02430eae25e3bad7aad8e209b3e96bdfd9c2d09f SHA-256: 9111a33c53584d94cb191b43e8080fc8954d7f7508384f5b1ccc732009b27020
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=how+to+play+rpg+maker+games+on+android PDF link annotation
    • http://alltimescare.com/attachment/files/ginoponusipamukete.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/zisobasesabiwupina.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/29936374977.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/83603326698.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/69428601054.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/wataroledalegefa.pdfIn PDF document text
    • http://akademibt.com/resimler/files/wewipifademu.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/galadi.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/56988107878.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/zazilasosavobewoletu.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/55061709645.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907024703765133.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tokuvubov.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dffcc316c---rinojisesisugenerojava.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de943ef35e---38464335941.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/10360612435.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/sikusesorabuxigefowodapo.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/xoguwavojofazagofada.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/9907730002.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/kexisimolexofu.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kapagima.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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 11016 bytes
SHA-256: 22b6fe5e9cbd7a71a6154590bf9425b040b56990ed1a579cb4b4b3cec569a75d
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 15916 bytes
SHA-256: ae28a0dadd1e63601d3976c18bf7bfc0c2ff1a4fb6ad96aec387f4d6ed90c890
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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