Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef5c14fef6432e3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 19:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1bc236d3205645d69228a24cf3a368d SHA-1: b06cf951e1e07ba9618756cb347525f0631936d6 SHA-256: 9ef5c14fef6432e3bd70acf7ccadee5b4caef833a838d3ae8e4fcee0b1b66976
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is part of a phishing or malware distribution scheme.

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://cructi.ru/uplcv?utm_term=android+airpods+volume+low PDF link annotation
    • http://epwuae.com/userfiles/file/paxapirujuj.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/34147037296.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/minikolesijuxofefoxotegam.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/68265557006.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/11002175946.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/67189361923.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e2c9a471a---72337972638.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/93313589300.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/kuzenod.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/8346993927.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/8094584034.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/zubudolod.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389049be393---lodizepipepiterufuvabewiv.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/70512549147.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/kujetomota.pdfIn PDF document text
    • http://chieucoingason.vn/files/37612825376.pdfIn PDF document text
    • https://seikai.jp/free_images/files/40356940089.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/31392929367.pdfIn PDF document text
    • http://vecsecity.info/editor_up/96698892048.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/25157500024.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/vubewezolib.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fawanixukomemami.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/95266243953.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/regivunodukix.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/binejeratixateraz.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 17608 bytes
SHA-256: 78f91fc0afb4eb7733b10a4e333a219aff29546c6d20fff68ef7083c475c5c63
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10688 bytes
SHA-256: 7b6501c02d19dd8ed6f5cc585d0bf0b9c7e563b18529c6b9eb4de64f12cec766
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1