Malicious PDF — malware analysis report

Static analysis result for SHA-256 39095549252195d8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 17:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a0dff7e484cfd604a9e17f8747963c4 SHA-1: e2944dde63cf34fecadd52e85ebc63ae91ffdccd SHA-256: 39095549252195d8d000558cb8233a60311cfb76164f5605b6f001ae8345cfed
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thaiwoodengames.com/files/upload/files/lanusopobiwazalikawaxewan.pdf In PDF document text
    • https://tenekedjieva.com/uploads/file/lunowaziro.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vasemu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911080325.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/24882892463.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/36540304304.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/salanal.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/26738574592.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/32741375586.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210901120451_406705.pdfIn PDF document text
    • http://aromata.ru/upload/files/tukukasikizuzaxarujenem.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189451aff7---veworojabekunonos.pdfIn PDF document text
    • https://hgb.se/filer/file/dutazaramek.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/3101386823.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/subivoximoviridofekat.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/xunafurovamuperux.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_62A0C8F1B94804C1.pdfIn PDF document text
    • https://llc-sahara.com/site/files/xurepomojer.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/rafegarunofinefik.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fd2a0473d823b21352839967b366d42b/wujavevemanu.pdfIn PDF document text
    • https://istanajp2.com/contents/files/93044878515.pdfIn PDF document text
    • https://ka-base.no/images_content/file/rotipawabimunidu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161424e39c76d4---wuwatol.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/pizaxirulelawinuvuwakumuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stream+movies+apkPDF 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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10496 bytes
SHA-256: 2d4295c7800a5deb2b80c7cfaa0348d61d5da27f536b7cbd31bb4d818afe1112
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 17396 bytes
SHA-256: f7877f96a91129c30c677c7351e44f8564c1bc7e248004583cb373da875d7bbb