Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282418fe442e64a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 17:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a8b7e500a83acc75c5e56b50d620291 SHA-1: 49761f124f6f7562001618a5d60752d6d6ce1279 SHA-256: a282418fe442e64a0f6ced5404af75828941f9bf27fc145b24b403085f2c33d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=android+systemui+apk
    • https://telewebmarketing.com/FCKeditor/file/tiginopufoxiwiriluzonuraf.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/840afdacbe6537a88c41f4f2b6923b97/sodefirugivuzedo.pdf
    • http://americansemitruckparts.com/d/files/zujujevomegubogawidodome.pdf
    • http://sung1.com/upload/files/43521175644.pdf
    • http://beming.com/ressource/site-image/files/josojatusenorogofeseji.pdf
    • https://unovosti.tv/ckfinder/userfiles/files/5336172876.pdf
    • https://hirurgija.me/files/31975970001.pdf
    • http://getdol.com/page_data/file/77480510420.pdf
    • https://bharatbiodiesel.com/userfiles/file/mefoxoligitoravewakimum.pdf
    • https://drhuanghair.com/uploads/files/202109251529208183.pdf
    • http://jn-zhsc.com/upload/wusifojar.pdf
    • https://suavitinhtannha.net/upload/files/jesugapaten.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc861eeda5---gemifewobibajuwewit.pdf
    • https://medicabg.com/uploads/wysiwyg/files/rulawafokozep.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/1299734678.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/3403138647.pdf
    • http://commandhousecreations.com/uploads/files/zuxoraribawuf.pdf
    • http://vhz.cz/user-files/biziv.pdf
    • http://medicaldistri.com/ckfinder_files/files/39491599879.pdf
    • http://c-six.it/userfiles/files/zijixitotapinorefi.pdf
    • http://sp3siemianowice.pl/userFiles/files/46460663275.pdf
    • http://odra.cycling-recycling.eu/imgturysta/files/kigufigibawigubugewep.pdf
    • http://rewitex.pl/userfiles/file/jomeganofosukirulisa.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_off0000bedb.bin
da6535a394d3799ebee2512be4cfe35b37e674487c2f9dfb6e0ee30d45c19bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDB 18444 bytes
font_01_sfnt_off0000eecf.bin
112a3d47363de56aa4fbe72e4393217bd0f94dda939fc64de8a08f9568fe6cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 10792 bytes
font_02_sfnt_off000107bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16792 bytes

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