Malicious PDF — malware analysis report

Static analysis result for SHA-256 94698e9159a25a16…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 19:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fab7bc3c61bc0295120d5e476160f4b5 SHA-1: 74ec6307ffcc63dd9965f0bcf0bbf6ecbd714426 SHA-256: 94698e9159a25a16c96461ef88588a6d092454d6f5b06820efb6669457aba1ff
146 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host malicious content. One heuristic specifically identified it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://coumert.com/images/file/tomakapesitimiderapeko.pdf In PDF document text
    • https://upbfassadenbau.com/upload/file/pazuvilovelofavezorerapi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fiseseguvanupisavevimusiz.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/5110005721.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/98991610078.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/16242594234.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/24968106725.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sitijonetop.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/21427454203.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/58723957967.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/4120362952.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/rubegi.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/foruzidotitudurufabiluzi.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zatisasuwi.pdfPDF link annotation
    • http://www.luna1956.com/images/library/File/85973163769.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/8330263948.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wulafuvamesuduvexesaxi.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nunokutizuwinebemizup.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/fidiwowupilolu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nubutonom.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/pusegijovonurudeti.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/93835109319.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473483da1f---55864689590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ensayo+del+principito+completo+pdfPDF 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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 10880 bytes
SHA-256: 3f9bea64d04256f32d87da99b039054286d8bf4341efb72c12c0a141ac204c76
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 19136 bytes
SHA-256: 6c205b50341d92853f3ba3b4ed6abfa5843b21e59b5a68e185e4657ecc4a8a11