Malicious PDF — malware analysis report

Static analysis result for SHA-256 203eaf66cb5c4ced…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 11:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7c5981e362e34d6a47c5c510feee423 SHA-1: 90cb9648d303a08b9c04da363cd1e91d237a7666 SHA-256: 203eaf66cb5c4cedbf9023c91d61c1edbb6a982feb3daaae5cff55e3eedb5550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure suggest the PDF is used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=sql+injection+tool+for+android PDF link annotation
    • https://xuantruongtech.com/images/ckeditor/files/35515104030.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/defufogi.pdfIn PDF document text
    • https://comfort8889.com/upload/files/vakadoguxejugebaw.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cec4d24---nokexokezomoletujexiji.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/luweluvugigilixiboxikawov.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/54350581800.pdfIn PDF document text
    • http://otczenacts.com/media/files/dirazububejidesujofinone.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/69360306584.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c8128eddb---45167418028.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/51590182949.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/nuwowupada.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49449195310.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/39284372799.pdfIn PDF document text
    • http://edituj.cz/res/file/69499808889.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/98837740634.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/pilebubakivogubewuf.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32873569513.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/5302661592.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/xadudi.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/82554954996.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xutobor.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xipeniwifomarosakud.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/welumabopuvaratom.pdfIn PDF document text
    • http://allasclub.com/campannas/file/24039696412.pdfIn PDF document text
    • http://taigesw.com/upload/files/vasugilepetoxujiwi.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/25429369075.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 17996 bytes
SHA-256: baf647ad5d9aed2f113c7705eb65c742a34f459594ad6cce7037f2d2cb6b73ef
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 10652 bytes
SHA-256: 2750fd87dd30e009eb543cf5f9e2a9fd4c8e675b28008f4b3e58b42182493453
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1