Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d179852351291a9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 00:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e932b35532f98c3b1d338249f2407c4 SHA-1: ce08599fcff8a2403beede3c7469652964246089 SHA-256: 6d179852351291a9156b74a04116ea34a3640e79f401d555cb9c703c02eb542e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://makenie.com/upload/files/megatunikubeka.pdf In PDF document text
    • https://wodepcb.cn/uploadfiles/files/75614126401.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/79233359672.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/68000209678.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/53574729944.pdfIn PDF document text
    • https://dalba.net/other_files/File/lowepudotedudeg.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d94a0d0c64e6ba1f9da34e53ba415331/vomojugukinejetine.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zijukabederowajesasugizi.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/nuwefubulok.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xujev.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/27855659355.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/foxokaxijipo.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/lorokogifenoguxudutam.pdfIn PDF document text
    • http://kaies.cn/upfiles/210905074644238786kizluc.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/62339648693.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/mukinowuzeranitozelegur.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/96689456483.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/91206340465.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47379893301.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/mesorizejopiwaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=super+apps+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 10524 bytes
SHA-256: de9d8b032f89504806912bbd5254feb8930d5082594d21fbe4cb49f32c665a9b
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 17672 bytes
SHA-256: bf77485dc2ec7139506af2313dd77b71b8e4b13cd5bc39beb44e1ce316efc267

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