Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfed0cc72c4fc8e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 18:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0a263532687995cb7fd43d2f28ee907 SHA-1: 27e2b2e61c9a4b4a76025923104c178147b2fbcc SHA-256: 0cfed0cc72c4fc8e4bf144b7304225f615a066701b2b64fe73d515d0f15484ef
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://umutfm.com/resimler/files/2090128625.pdf
    • http://phanvienphianam.com/uploads/userfiles/file/67845012117.pdf
    • http://www.deco-interieure.com/userfiles/file/22550611186.pdf
    • https://artesapanaderia.xyz/aym_image/files/54506956389.pdf
    • https://cnc-ar.ro/files/file/7523291727.pdf
    • https://myclubowners.com/userfiles/files/90763237105.pdf
    • http://cukorbetegshop.hu/files/86567035900.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/60643589470.pdf
    • http://epmachine.ru/d/files/51583609717.pdf
    • https://dongciao.com/uploads/files/202109060815541628.pdf
    • http://ned.ru/uploads/files/13735899463.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/7n8ede1s8i5vkrfkqm5cood484/69840795317.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613551724aa8d---80212456261.pdf
    • http://theprofitnesstrainers.com/userfiles/file/sonoxajozumi.pdf
    • https://portalbime.com/UploadedFiles/New/file/vedebo.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/rosemifuboti.pdf
    • http://gfb.it/upload/fck/file/zudobupem.pdf
    • http://biopublisher.cn/files/upfiles/file/kofukupogoto.pdf
    • http://obasekiestates.com/UserFiles/file/62726333054.pdf
    • http://wsm.hk/images/uploadfiles/file/fufazejelajunasewuz.pdf
    • http://zhihepvb.com/upload/ckimg/files/202109050011515918.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210905_F99537870DC7A63D.pdf
    • http://vning.net/filespath/files/20210913222849.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+ruby+rom+hack+download
    • 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_off0000af3f.bin
8a13d718e433bb9f5077c5fee3203e5a4ed53e6331f56d862b1d4f59620cea73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3F 16344 bytes
font_01_sfnt_off0000d8df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 16792 bytes
font_02_sfnt_off0000f0f6.bin
b0de7f804b523db379fd51956d8f0925045016acd44059e37b6a2b43ec09df23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10812 bytes

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