Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d6c958b068d29…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 20:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dc43fe8e0e5434360d356b7c2fed56c SHA-1: b91f702123f9f49bcadeef33a2003aa3352fa281 SHA-256: b25d6c958b068d29b26bde2430e76d608f520deea588ae631986c9ba055c96c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including ML classification and ClamAV, flagging it as a phishing trojan. The PDF contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=multivariate+calculus+pdf
    • http://leaders-adv.net/userfiles/file/gajolaxero.pdf
    • https://businesslife.com/content/files/rulimeluxovufixebapumobuw.pdf
    • https://weborder.cloud/userfiles/file///famojebi.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/24576960551.pdf
    • https://aromamarketing.md/img/files/luwapuzejuzuvajivilulop.pdf
    • http://rymwid-training.com/userfiles/file/29633420233.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/15435780579.pdf
    • https://scout-educationguide.com/userfiles/file/13594314109.pdf
    • http://gemcom.org/userfiles/file/76619603767.pdf
    • http://ppfi-online.com/userfiles/file/dulinopunebigejupox.pdf
    • https://e-midas.ro/files/file/82737065015.pdf
    • https://cukimentescukraszda.hu/files/files/15992666083.pdf
    • https://adikkeempat.com/contents/files/muxejejoxusexaminosa.pdf
    • http://mistral-paints.cz/userfiles/files/sudepegalisusofoxovif.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c24a9767f---sunomisi.pdf
    • https://magnettoptan.com/upload/ckfinder/files/wagipod.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/zoxurezaniwowenuliwug.pdf
    • http://ventilatoryzlin.cz/images/file/rijukegigubizirubilet.pdf
    • http://fatfailogistics.com/fckeditor/files/file/demonatimokotujozupumowat.pdf
    • http://keemunblacktea.cn/uploads/file/160243554348.pdf
    • https://conrays.ru/f/data/87558581887.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/76176643255.pdf
    • 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_off0000bde3.bin
bb3151bc04384f85b6602f70dbc78a6e798f45a674889dbfd144cd03e95f4319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 10548 bytes
font_01_sfnt_off0000d615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16792 bytes
font_02_sfnt_off0000ee27.bin
70b33d14255792279db0b1f15c75a14d85c9bc19ece90ac60de61b06ea158d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 17744 bytes

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