Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7babe527df505d4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 03:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47df5eb75310fdb95b54b22bc59fe9ee SHA-1: 3ef3239e36d043d20189cee9d46ef21eaa770d38 SHA-256: f7babe527df505d40596d67284a881ac12941324dff640a3771cbaeaaa7409e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://venus-forever.com/image/files/86102897604.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/xobesunidu.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/lapavokumakipanixapukafox.pdf
    • http://legalinet.eu/userfiles/files/25100663304.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16145b7e9bd467---zunifuvolesawegitesitazep.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/46718755928.pdf
    • https://www.pharmawell.eu/ckfinder/userfiles/files/wifima.pdf
    • https://milosislandrooms.gr/userfiles/file/96916237872.pdf
    • http://yongchengtech.com/uploads/files/202109041415371220.pdf
    • https://granitabrasive.ro/editor_up/34866264392.pdf
    • http://stauarchitetti.eu/userfiles/files/12243567531.pdf
    • http://caydinhlang.net/userfiles/image/file/depujesi.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/31086764687.pdf
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/61495455817.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/69136824005.pdf
    • https://mehreganimaging.com/images/upload/files/vomowazejo.pdf
    • https://virtualpulse.eu/UserFiles/file/3011656896.pdf
    • http://autolubitel-irk.ru/userfiles/file/30771971957.pdf
    • http://smirna.pl/files/file/lowegabanoxikubikozexife.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145daacebea1---wikifikisejut.pdf
    • http://bayanairag.com/uploads/userfiles/files/39089252317.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+galaxy+grand+2+hard+reset
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
font_01_sfnt_off0000f516.bin
277f44e7436c596ae729b2fa633c510365e0578ea476460feec3a37576f41c61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 17696 bytes
font_02_sfnt_off00012326.bin
50a1d02958714017fa4e673522349948c15b75583a4cbfd67f53d0c4799f6502
pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 10996 bytes