Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f336a58177789f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 01:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ff8feef25aa4152080dae795945232 SHA-1: 10f1b567a03991d61f751cd93cc4c68e7bc833b2 SHA-256: 24f336a58177789fdd5f78d3209ea36d761a2e5ab3aef58cd9d73c332d9ffb0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many pointing to disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tebra.si/userfiles/file/karurubidoxuwo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/692346ddcf11b60eef624f780d28aba0/71041802568.pdf
    • https://xcheck.vn/uploads/userfiles/file/36917313142.pdf
    • http://ilturismoinitalia.it/userfiles/files/leluvixisizevapuvoporixe.pdf
    • http://galenbio.com/images/upload/file/dumoxepisirifevemu.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/47785039188.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/17563594146.pdf
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/64275033941.pdf
    • https://kawanmto.info/contents/files/86584426907.pdf
    • http://dgjst.com/upfile/file/63584586351.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/lekisopuwasol.pdf
    • http://studiofranzoni.eu/userfiles/files/36990215454.pdf
    • http://klpa.net/userData/board/file/73035270758.pdf
    • http://chataphan.com/file_media/file_image/file/81233821745.pdf
    • https://spvi.cn/filespath/files/20210910164706.pdf
    • http://nomayaku.com/userfiles/file/24176258541.pdf
    • http://chuabenhxuongkhop24h.com/images/files/jetosowesovirafamo.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdf
    • https://thucphamtruongxanh.com/Upload/files/70867869015.pdf
    • https://yocarbroker.com/upload/ckfinder/files/fozejivonapudawexulebeb.pdf
    • https://ice-group.pl/userfiles/file/31658696661.pdf
    • https://sklepbonus.pl/userfiles/file/44502959980.pdf
    • http://selfmadefilms.nl/userfiles/files/9584196496.pdf
    • http://solartgaleria.hu/images/file/zaxavirivikuxoxixusewu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+hero+academia+season+5+episode+3+watch
    • 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_off0000ebc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
font_01_sfnt_off000103d8.bin
ad646647be5041882e12e76dada3b15d2ddc487cb4e5ac5bc2244190fe96fa72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11232 bytes
font_02_sfnt_off00011e1c.bin
97ba3ed1b139681d556f09ca8acb182b184c48497668d7d68a0ebb9f93ff655f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 17600 bytes

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