Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ea42f18f4507c1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 06:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb7dfbe5f0056b88795cd9e5abb57ddf SHA-1: b2eb34d032e345f317b9375f16a00924b7100ecf SHA-256: f3ea42f18f4507c13a396eb5315e8864bc4a03d6d871b3707eec65325677d65a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://gtlitalia.com/userfiles/files/gaxugitabo.pdf In PDF document text
    • http://soojuspilt.ee/files/file/wiribofe.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/68815841793.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5515681742.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/dabovirafaletatevu.pdfIn PDF document text
    • http://hkalc.com/userfiles/nomeburikativuvaxesazemu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/28544627089.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7159643857.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/romezefovurexutufimulok.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/sevifidep.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb177adea1---41995260859.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/63574015900.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52012723954.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/77414431491.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40567702939.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/49998849699.pdfIn PDF document text
    • http://suaups.net/userfiles/file/zosevap.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/nixewo.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/49780957800.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a12f2fae7a692aabfded326238980f94/65501105959.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/11095831534.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/89304957740.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/34156478327.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/dusupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+setup+email+on+android+phonesPDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 18164 bytes
SHA-256: ea11f2cc1d81bd3510e948bc7d2717afa76440e6ade91125fe03096af5521b81
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10836 bytes
SHA-256: 74a98be5dc3386d9768a5b1ee78048f1273b946f3033a6c7949f06f3c5a68ddd
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1