Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f2d58a4304fc8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 23:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17e2094963d331cbd2582d94fa57c618 SHA-1: da3f79f23e8a639089aeb0201e23c9a233ad3a62 SHA-256: 5a3f2d58a4304fc8df61d1ead66959ff06b1d6cfe4de550eca35477906eb2c9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one notable URL being http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdf. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdf
    • http://thietbiantoanttk.com/uploads/files/53007550988.pdf
    • http://aytekinpolatel.com/image/files/fubijitizojatuxurikamede.pdf
    • http://eventologia.com/userfiles/files/87966616235.pdf
    • https://alwaysthesame.pt/site/upload/file/pewisiminerezasosum.pdf
    • https://motelandratecuci.ro/userfiles/file/xisiwezotijane.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/sezofipike.pdf
    • http://cesvil.it/filesUploads/file/tabefewi.pdf
    • http://wamaeassociates.com/images/uploads/originals/file/33328373122.pdf
    • http://esipro.fr/userfiles/file/60306168943.pdf
    • http://droneducational.com/admin/userfiles/file/wuwesuvelebi.pdf
    • http://hrudolf.com/userfiles/74196265479.pdf
    • http://canyonmeadows.org/userimages/50982782876.pdf
    • https://dragonexpressml.com/userfiles/files/23590613354.pdf
    • http://rayer.cn/d/files/rubekafilenanon.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdf
    • https://garnet-medical.com/userfiles/files/92381924802.pdf
    • https://seo-methodes.com/userfiles/file/17932784006.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a34f6d562---welarerivipozivafofokaxim.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/26cab026f084be019ccd4a9d2cce9046/38242871496.pdf
    • https://vinaconexmec.vn/uploads/news_file/41794272508.pdf
    • http://crm333.com/documentos/file/sigaturubitu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=je+i+joe+movie
    • 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_off0000b1a2.bin
d78bd558b43db86ef7d643fb3c7795d0c45ff117dd1fd3768a288bcb628d7454		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 17508 bytes
font_01_sfnt_off0000df0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
font_02_sfnt_off0000f723.bin
8f534100ec131878222b88e4867d18f0d101e0f6ae977f0bec8b06cd6532c401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 9776 bytes

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