Malicious PDF — malware analysis report

Static analysis result for SHA-256 83601944994c3c9c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 12:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4db50bc65c8062e44a04076005e6d63 SHA-1: d3bc59d90b030a78e0159783ae9791b70eecf995 SHA-256: 83601944994c3c9ccc3a7688e57f91f544214bd1277863eeb86579aa21472115
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or credential harvesting campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ipai-bg.eu/img/file/gulakuletisa.pdf In PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/23839585975.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/26998411836.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/24606249507.pdfIn PDF document text
    • http://esistore.de/userfiles/file/96821308739.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/58281902050.pdfIn PDF document text
    • http://uco-kampen.com/media/files/galewibomejet.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/39121013686.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/kejinimawuvuwimowire.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/vipoveti.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04e8c879---potutamelugosiwu.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911101943_0d5bai.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_235237.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/89413164073.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/waluvore.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/32325269881.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/kewoluwivalubemitunole.pdfIn PDF document text
    • http://naviway.su/upload/files/58740354827.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/41347534145.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14759515446.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091106244043.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/72010225651.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/duzuvoparavaguwosel.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/9121690659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cruella+2021+streamingPDF 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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10756 bytes
SHA-256: 1ddfe511177b83774b14f1750d253c742eb7395ce3186f650d19a8e9a4b0e81b
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 19276 bytes
SHA-256: a64ba7b81a8d64bca47188ef396a99282de837f700b2bede09ecc76cfe4fa672

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