Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c68d1c74c6b2229…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 06:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b6a86f8587721cfe31cb799cf37b06a SHA-1: 0552334d6babf53850c6ffd0db63b0f6ce7981e6 SHA-256: 5c68d1c74c6b2229185243ac5bb83dcc89b4651ce3f7c3acb87177c9590b13bb
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The presence of many links suggests an attempt to direct users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://fairbank-ia.org/admin/ckfinder/userfiles/files/324612819.pdf In PDF document text
    • http://video-cycling.de/files/file/2135027929.pdfIn PDF document text
    • http://mestan.by/images/file/rotitixikisopabu.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/26351471979.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/murefekobususu.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/31639692866.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/zofup.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/teguvibusaf.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/tikop.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/josuze.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/64752051914.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/94717826596.pdfIn PDF document text
    • https://papiratisk.cz/soubory/vimimipabisa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef65c3fcc---2557179855.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/piramozizujovixilupux.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/32218983364.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/94278830143.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/25134551083.pdfIn PDF document text
    • https://kawanmto.org/contents/files/33721282764.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/liwoka.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/10722783765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=zombie+frontier+3+sniper+mod+apkPDF 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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10980 bytes
SHA-256: 2ad773c409c1045629b07417dceafdf08f3b9296bbd98aed3d16577ca91836c3
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 18300 bytes
SHA-256: 2baf5ed4fa606e2c229fb47dbe6754f8b6b5ee8f43055c57da503ae378d4e330
font_02_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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