Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56682fc5a7a4c42…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 08:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8166a71cafe51c17ac8840a4ce0bf345 SHA-1: 0a3ebed0c551d1a74c489e3baae78d81432c3e74 SHA-256: e56682fc5a7a4c42493190a416894bc93653505527b3629e27a8377608865261
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that likely lead to malicious content or further infection vectors. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://epmresearch.org/userfiles/files/70887651880.pdf
    • https://vildmarksjagt.dk/userfiles/file/42382545264.pdf
    • https://shinaltd.ru/images/file/19739507632.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kvv3ndj92s2o6h5u8sasj97sf0/leturisoke.pdf
    • https://sedefartphotography.com/resimler/files/47010003158.pdf
    • https://rails-bg.com/fckeditorfiles/file/kosikewaxaradanoroloritov.pdf
    • http://arcomproltd.com/userfiles/file/98910689237.pdf
    • https://webhosting4.net/media/file/jusiru.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131728be27fa---wobetinivivurawotinemozip.pdf
    • http://tomgiongvip.com/uploads/files/file/widagamaminog.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/42041464523.pdf
    • https://vitanov.rs/files/fofefolokubisemena.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/35639734914.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/52226110531.pdf
    • https://tannhatviet.vn/upload/files/bemux.pdf
    • http://hasicimosnov.cz/foto/Image/file/27127324155.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/44219330601.pdf
    • https://galerieportelouise.be/userfiles/files/34822348157.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/5684597550.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/50634140328.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/53229004519.pdf
    • http://vngo-cc.vn/cooker/public/files/60414762895.pdf
    • https://hamasataccessories.com/userfiles/files/petusunizajajafizuralero.pdf
    • https://asi-filter.pl/files/file/xanifapozir.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/26068351194.pdf
    • https://canevastoilestjean.com/upload/editor/file/50182418720.pdf
    • http://hantechwelding.com/userfiles/file/2021091214104373499.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spanish+nouns+that+start+with+n
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffc.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 1820 bytes
font_01_sfnt_off0000e882.bin
7f56dde1a5130830bf112fb0113db70151b277d230fe8d5aabb732f3f310667b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 21528 bytes
font_02_sfnt_off00011e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
font_03_sfnt_off0001361d.bin
e63df9e76d88d22f8a544909e4662a830b58077b68bda1ece2f6e50d8026c3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 10432 bytes

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