Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a6829648335896…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 03:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c767e149ed2045462ffca9b1db9026df SHA-1: d2674fb9617d6d3044636f71624c47a9bad5463e SHA-256: a0a6829648335896fc3fed749bef113f44a3196b5371f713300936ec0bfb6b0f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting domains. The embedded URLs, such as https://philabc.ru/uplcv?utm_term=dual+audio+movie+watch+online, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=dual+audio+movie+watch+online PDF link annotation
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vupelejabizoxusaduviruzop.pdfIn PDF document text
    • http://cmtsport.com/pliki/11758516007.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/gukoxipuvifadagebete.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219231952229781.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/remuvoxizalesagitufijug.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/44343361343.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xejog.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614212861083c---soxufipijogowatazaxurokew.pdfIn PDF document text
    • https://insp.biz/img/file/56188284794.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/60171395241.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/9689548472.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090605482369.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/84798373057.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/wijiwiwetajowabu.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6640981594.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/57979214947.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/kumixalidu.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/98513308852.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/panape.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/52007038754.pdfIn PDF document text
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/salademijigikejofobaronig.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/limus.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/xetegurisirepanaxizidatu.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_off0000b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B7 17868 bytes
SHA-256: 4366680834f2e8b5a11d33a1c57cb26acdb824e0879d82d4660b018605af4857
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 10620 bytes
SHA-256: 9f0bdd140eb2f21a7161f4cbd16b2e1dfcdc7a4bac761696ed62db67c4655aa7

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