Malicious PDF — malware analysis report

Static analysis result for SHA-256 9916899ba191e210…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 19:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9adafcdce5578abdf9bd0b3abf01d51d SHA-1: a6bc1c83706671399f06213cdea33f5252127af6 SHA-256: 9916899ba191e2102083c9b63a837fe8996524f349b713270ce07c8eb7d035cd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic indicates an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://tianlanip.com/filespath/files/20210905070834.pdf In PDF document text
    • https://urbanlivin.lu/userfiles/files/papijejejame.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/tosurepu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/89913294466.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fogujeju.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5dojmq81d2h6ifiiha4212d3e8/witukoxukupotarafudamon.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/merixi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/76901864859.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/jiwedajibulonuvesokagid.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/reritape.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6f59bd66---nerejevetikavefajixu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/37814716925.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/16645107971.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/fetuzoti.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51461727786.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/sofarikaxox.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109051346004147.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/50713107635.pdfIn PDF document text
    • http://eichler-kammerer.de/39849979843.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/73674836454.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xofugutomukonawapafigoxad.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/94076820477.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/vujuboxanigotegaru.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kafezanule.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/xosum.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35981762731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=my+mini+militia+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 24552 bytes
SHA-256: 58273df3d17b37593e20e8d3c3be7bd1466cff7a73358eaeabc9e9fa7c6d9585
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10436 bytes
SHA-256: d2c0a45b9db3c5b2f676283ea3172a66d1b7f8149b93aee07594507f06b0c387
font_03_sfnt_off000146a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 16688 bytes
SHA-256: eed84d3b9a8a7a146d09a80ba95623ad9ca79cba8ae52e9cd3a33a07b3cb18c9