Malicious PDF — malware analysis report

Static analysis result for SHA-256 f662922d687cf198…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 10:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f24632653fdc62ce91b48e14b58300c SHA-1: 5e10329c17c0bb245d65b0d8d5eba6e6c36e8e06 SHA-256: f662922d687cf19887392f4df78e47b40f86295a0eeeb72a3009855f00c3a370
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains and appear to form a link farm. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or exploit vulnerabilities. The overall structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=the+sims+4+all+packs+download PDF link annotation
    • http://preciz.com/uploads/wysiwyg/files/37220672476.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fixikopelexojagikari.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/mosowepukafijuvisujajono.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/67714834388.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/dobemabepiniz.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/79135607180.pdfIn PDF document text
    • http://turatabor.hu/media/returuto.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/58690250133.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/fenuzajuviwasizenorivev.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/walanazosevasojogaza.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://huonglonghotel.com/uploads/image/files/40442855128.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/sipixasamisupumudepozop.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/polakutufufajunifazudiju.pdfIn PDF document text
    • http://sparkpro.lv/content/file/wipoluzulusiropedevas.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/59195383114.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/72106898974.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/16685831993.pdfIn PDF document text
    • https://kenadong.com/contents/files/37055055451.pdfIn PDF document text
    • https://quizai.com/uploads/files/vakuguwim.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/95096184641.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/21986010401.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008af17e0d---44896794522.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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 15452 bytes
SHA-256: b77531717d75de7f53893e0ee58d4034d7ea4ccd869f28da9bb120b80fd1987a
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10800 bytes
SHA-256: e924be4f318e7a3c3d59bd5e5e47fbddde7f91722a5f3ffac504b2753cbe517b
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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