Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19decd510afcd5b…

MALICIOUS

PDF

112.3 KB Created: 2021-10-05 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d06bba2026d9e20361b3eabd78a5cad SHA-1: 6c4bda7b4e8c2d2f6e34114fe7d474f7f808d176 SHA-256: a19decd510afcd5b19e2b37f9fda3a59d222ac6391476650184dc52f20648fe8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=following+in+their+footsteps PDF link annotation
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/busifipuv.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/24378661380.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/tebonabipiximavudurovuri.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092110171273499.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/55951035499.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/1031015162.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/84004499024.pdfIn PDF document text
    • http://hangquangauto.com/files/51911553717.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/51bc8640c8e5c2fcabf44e5ba984a69e/wimatumoj.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/48551098297.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/301550009.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/49062956906.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/54100497617.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nixuzuli.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/kadixoviruzadov.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/ravituvupasejalabo.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/vumalejuge.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/68fcf19510af028b944323ad563dab9f/gibikevugonotidekapubaji.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/gixulafo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/fikepipow.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fusiveredunubezedasari.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/59507912060.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/4947376785.pdfIn 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_off000154d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D4 21040 bytes
SHA-256: 443ea33252de530c8abd679044f03519dbf70d81511941536f64ba49edf679ce
font_01_sfnt_off00018a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A86 10540 bytes
SHA-256: a6c918022219eea25eb58eacb796b4225b8a69f4109294326dec33beab4f7f30
font_02_sfnt_off0001a286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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