Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3f65b578ded608…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 00:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: addf642c8f66641d2268dc8dd80c5330 SHA-1: 9fd333de1324c4e8a7479a33bc0225c5e2e7fcae SHA-256: db3f65b578ded6088dc1d7141e81ffd8571e5b926c31e221018a52ca9d2d6d13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is intended to redirect users to malicious websites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://swiss-ex.com/images/blog/file/dogibasorotanipis.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161414afe5a7ed---zofedexofoxagenejovu.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/84729650554.pdf
    • http://www.kotolantopeni.cz/files/25320982836.pdf
    • http://patroha.hu/file/48551538016.pdf
    • http://booklandbooks.com/userfiles/file/4276762766.pdf
    • http://iscelenie.info/files/file/50276251907.pdf
    • http://srub-servis.ru/userfiles/file/39969213269.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/pogosi.pdf
    • http://z-him.ru/userfiles/file/ponokoxixubipuga.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447410734a4---75989879934.pdf
    • http://finadev-groupe.com/userfiles/file/kuvutomigitevuvalijexafu.pdf
    • http://studio-orlandini.com/userfiles/files/kupujepo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+we+were+liars
    • 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_off0000c459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC459 16792 bytes
font_01_sfnt_off0000dc70.bin
892c9859815e5bb43f9f063e87a7e56154ada41cdf4939492e19ef0a637bb4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10112 bytes
font_02_sfnt_off0000f322.bin
6baec49330481e6857b2a11478b699598284655d98c5ca1dfb5f8434705d76fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 17160 bytes

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