Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7afd7bd1d372fad…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 04:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15da40d73116943a3648c1fe54d9702d SHA-1: da60671a8cf22ec0077aa09b31ff8a697fb1ce48 SHA-256: b7afd7bd1d372fad52849e43620c207b4d96b8e63ac53d2f0d26a1b37995d435
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various domains, coupled with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests a campaign designed to direct users to potentially harmful content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://iphysiology.ru/upload/gisetodumidumajerebuwu.pdf
    • https://detectiveoffice.net/userfiles/file/xeroroxemaf.pdf
    • https://pnvvr.ro/userfiles/file/jezas.pdf
    • http://shahgrp.com/uploads/20510909106.pdf
    • http://tamphuhiep.com/Images_upload/files/41668700545.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jetakewepavavorogem.pdf
    • https://weldingportal.it/userfiles/file/57549495955.pdf
    • https://mogilew.ru/userfiles/file/44014083080.pdf
    • http://bielwod.com/userfiles/file/55843049890.pdf
    • https://highrise.pl/file/66352307007.pdf
    • http://vpecargo.com/userfiles/file/rumitapedilaz.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zukofivefetoxakukenajifo.pdf
    • http://ciba.lv/uploaded/file/lovitevuda.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210909001217.pdf
    • https://shevtsov-art.com/uploads/files/21054163177.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/wuxed.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/25731074323.pdf
    • https://triosms.com/userfiles/file/61347613519.pdf
    • http://china-zub.ru/userfiles/file/vavajefigiji.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zuvonifozelakegamod.pdf
    • http://geose.ru/userfiles/file/vaxotunen.pdf
    • http://salonmysliwskirys.pl/userfiles/file/48123605444.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lqknajp1vn9bfucddmo1jgtso5/88377080640.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/98147712650.pdf
    • http://ibb-online.ru/f/file/52899565508.pdf
    • http://aceonlinementors.com/userfiles/file/nafakedifikebufopomalif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=star+gold+live+streaming
    • 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_off0000c5d9.bin
eef9bbccdd4e4ac610de34e2e3efe282ced07c77f6e663662d6eecb54c1ca7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 10732 bytes
font_01_sfnt_off0000de40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 16792 bytes
font_02_sfnt_off0000f652.bin
78ce95633c432f1087d86c1512ac5868484b89ca5146518b161a5b71a59657c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16640 bytes

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