Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d74e99972428e3e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 17:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71aa2cb87f0563eb9cc1c7d2b7219bf7 SHA-1: b991e61348b5b2ac58e96bac9557afa626c84567 SHA-256: 2d74e99972428e3ed8612781328661e30d814b7f5c97194aed0fab6713409b66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=interactive+porn+games+mobile PDF link annotation
    • https://hinaweb.com/upload/file/dizakufidu.pdfIn PDF document text
    • https://hirurgija.me/files/xurebebim.pdfIn PDF document text
    • http://deforma.it/userfiles/files/muvan.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/25429081116.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/luboxoxo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/kufosekabuwodujojapoporeb.pdfIn PDF document text
    • https://eternalbliss.net/file/13094570642.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vaporu.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/84349251528.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nerirurivipi.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/98968657033.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/nikakezilesifumifimogoj.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/62093826457.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdfIn PDF document text
    • http://stl-hk.net/userfiles/74680828775.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/palirilarikeg.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/xorepasizuduvuved.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614169726dd44---83475595788.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52986354940.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/33705824732.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/49428999122.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/79442645054.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rofuvetafopewa.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_off0000aeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEF 15104 bytes
SHA-256: e346c3e8bdbe97af9526754ade479b4cb33f56b4267b749d0832b409ac175136
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10876 bytes
SHA-256: 98b84e1679fa3ea0ba9f2d858eb839f1eae46de6620630060fbdda33dc871fb4

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