Malicious PDF — malware analysis report

Static analysis result for SHA-256 574a6d4cfadcd0b2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 00:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a39b5196997e78cd383e662faae07c3 SHA-1: ed2505d5f31ea4481f5fc1ab55fc530e78c0c6aa SHA-256: 574a6d4cfadcd0b20c7a26b8781baa61e3380459a53c5d0483acdf8bd06ecd74
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. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or redirection mechanism. The presence of external URI heuristics further supports the attack pattern of redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://epoptavky.com/is/images/FCKeditor/File/zomojimedezefisobukizixak.pdf In PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/lifijugugokejesigeteta.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/215135213.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/jilawusojez.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/1924513090.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/juxidegotulukevadesanune.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/78393935626.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109161551319972.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/njfq7dv0l896hsllj03og8up8c/janodexu.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/81029512896.pdfIn PDF document text
    • https://kimansion.com/uploads/file/womibamabedo.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/fubijakanuregaj.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47505760490.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/27590589914.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/19586842241.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zojigevi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38957790155.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/kovajogunozopadenerijo.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/68510765022.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/wogadetudawumibiteku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+jetpack+joyride+hackPDF link annotation
    • https://b2cdemo.tickets.com/content/files/kipakopunewumure.pdfIn PDF document text
    • 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_off0000af7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7D 10712 bytes
SHA-256: d347b198147f447adcd96abfc4892dc11e8f11533cb23a89169f5c853374aab3
font_01_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16940 bytes
SHA-256: 5308815e7cbb40341c1ac744b3776a3b98a0b9ea41fffb582c0403e153a5b2d2
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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