Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e67f4798ef95c0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 04:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc574d0ff9b2f28d1678e58a87a1e793 SHA-1: 7c38f4d091915d5a8287ef68f0cd2fce67485f6e SHA-256: b4e67f4798ef95c084b13a13c5fff6bf1ae85e638249d26fcd1a18c427a75160
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm hosted on disposable domains, suggesting a phishing or scam attempt. The embedded URLs, while many are confirmed benign or unknown, contribute to the overall picture of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bibliotheque-des-arts.com/ckfinder/userfiles/files/kolapediwujixuxusiworutu.pdf In PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/31219745857.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/42650475676.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/82161319179.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24863426185.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/vudizijar.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/18618513324.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/62664713677.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pikoweses.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/46533360547.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/20288601960.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/56d0ad3387b3f2379f3323b9bd3c3ba5.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/zufavokewimezu.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/90159150338.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/gisidilusosepozosezitiwi.pdfIn PDF document text
    • https://strechybenesov.cz/content/tovimibabupobuwunex.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/xoboji.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/kigizilegejokibaruzozeg.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/jibef.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/kakeben.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/tovezapoluwe.pdfIn PDF document text
    • https://davnosti.ru/upload/garezifemevusadumitap.pdfIn PDF document text
    • http://villkasz.hu/editor_up/76036592947.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kijimoxe.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/jebapaxobidemavamabejiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+diamond+gba+emulatorPDF 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_off0000b713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB713 10756 bytes
SHA-256: 3dd5b467170ac4bda8306c5e35b7f35c3fdce9c75473826a032d6088c0dc435a
font_01_sfnt_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 18016 bytes
SHA-256: b05148b28085f5c28e95e140e61a9b3563412c41cd46161f0927a864a7aefbd2
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1