Malicious PDF — malware analysis report

Static analysis result for SHA-256 071ac402d1f6a010…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 22:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d49d7a17be535a064d84cfddd2418b18 SHA-1: 6a10aef040354076d5a2e01e0c44d85682abe786 SHA-256: 071ac402d1f6a0101110e3bbd9eb4f8e4f12113666bc720deec0b5a78e2da3d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent. The presence of external URIs like 'https://philabc.ru/uplcv?utm_term=apk+gta+v+download+android' further supports the conclusion that this document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=apk+gta+v+download+android
    • http://kukdae.com/files/fckeditor/file/wanopazadudopavozeza.pdf
    • https://purmoradiatoriai.lt/images/files/nupiliw.pdf
    • http://livestocktool.com/d/files/66287594939.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/tozexipamulofenab.pdf
    • https://rakowka.pl/userfiles/file/17421620106.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/39543310580.pdf
    • https://journalofcritique.com/ckdosyalari/upload/files/sefeditorukeroka.pdf
    • http://dallard.fr/ressource/site-image/files/36853712746.pdf
    • http://yds-wcv.jp/free_images/files/purozop.pdf
    • https://partnermind.cz/images/files/tupibo.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1765099d---gepuzag.pdf
    • https://sgcaregiver.org/contents/files/85846291250.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/tukitegi.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/76391557187.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02e993ad6---tekajo.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/10138718754.pdf
    • http://dastone.ru/userfiles/file/42567657630.pdf
    • http://takramaipai.com/mypicture/file/24517465669.pdf
    • http://skogsformedling.se/bilder_umeny/File/93714363095.pdf
    • https://netkat.in/ckfinder/userfiles/files/44252170815.pdf
    • http://architettoseneca.com/userfiles/files/28623050403.pdf
    • 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_off0000d152.bin
d0d365b0954b070ad6b8b43ab7fe18f446b95c2636ecbc70312475aad0796dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 18156 bytes
font_01_sfnt_off000100a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 16792 bytes
font_02_sfnt_off000118b9.bin
3fb5967dca062531883121d85a69de7c3163d8622361e99696c775866c2c83d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 10492 bytes

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