Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0fb14319e5667d…

MALICIOUS

PDF

95.0 KB Created: 2021-09-17 13:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43235a41793f9076e5cbee125a201bc3 SHA-1: 333304da61d901d7a72adde4aa49e3e8fab8a73a SHA-256: ef0fb14319e5667dff93352760dc4286ab3d5774129365414a0b991fd2d004c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly implies an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://undergroundtakeout.com/userfiles/file/mudosovixegewudodifufedux.pdf
    • https://xylemleads.com/userfiles/file/nozikimofawagafa.pdf
    • http://toyotacri.com/userfiles/files/40766238656.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/dapuzevewilurupan.pdf
    • http://sbstroy53.ru/img/files/74060231148.pdf
    • https://eccdc.org/application/webroot/userfiles/file/88231116107.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/37462336539.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/48850242321.pdf
    • https://adikkedua.com/contents/files/lotobixafid.pdf
    • http://evola.it/userfiles/files/nesewanafavolaziduwedaw.pdf
    • https://bednidhitraders.com/userfiles/file/jejukejagolawurikiza.pdf
    • https://niboparis.com/upload/fckeditor/files/xovazobupobekofuziwipufi.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/pitinilewetilufurogugu.pdf
    • https://demircanticaret.com/userfiles/file/57424345955.pdf
    • https://flexi-cms.com/uploads/file/vawajuj.pdf
    • http://gsmontaggi.it/userfiles/files/xaxotasutaruv.pdf
    • http://olympicburger1988.com/uploads/files/96991404851.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49565356072.pdf
    • http://isleford.com/filespath/files/20210906172042.pdf
    • http://lamekatus.com/uploads/ckeditor/files/46043356672.pdf
    • http://weshare.vn/attachment/files/89674014393.pdf
    • http://izeninfo.net/admin/upload/files/ropokojovaku.pdf
    • http://unitec-egypt.net/userfiles/file/nerigavezolaxemobekaku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=club+house+download+android
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/molujuzarurikot.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_off00010cbb.bin
cb3c16ddf18f431002fd0ab587e2f4d2282792acb86f438ea3c92d79ab43f9ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 10604 bytes
font_01_sfnt_off000124ee.bin
d80f0ad8fc15e0db71e926826777d62216da96815e20f2accf89c944f8641487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 19140 bytes
font_02_sfnt_off00015693.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 16792 bytes

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