Malicious PDF — malware analysis report

Static analysis result for SHA-256 382479a2d4604f94…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 504eb1bc03d38b708c2129c922918d43 SHA-1: de9dca9d723669778b2699e43ef50473bf7d6b90 SHA-256: 382479a2d4604f94676f9292ff388e186c8b0e49f3050af2dccb4e938e672846
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. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=pokemon+white+2+rom+android
    • https://topclassgardening.nl/images/file/koxuguvuvalirovep.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/26562744759.pdf
    • http://vinaktv.com/storage/ckfinder/files/rofiri.pdf
    • http://majorpropertygroup.com/userfiles/files/52780461622.pdf
    • http://xedaptap.net/userfiles/file/fevomewodoxunifad.pdf
    • http://liburnia.pl/userfiles/file/xudeduzif.pdf
    • http://reclameindex.nl/images/uploads/66184238101.pdf
    • http://simkoongschool.com/uploads/editer/files/gavujig.pdf
    • http://aktifimmo.lu/userfiles/files/mijajagonusokegasenon.pdf
    • http://cmrivestimenti.com/userfiles/files/vofiwubukolosexaki.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sapejogelinakowomepako.pdf
    • http://studiolauramoschini.it/userfiles/files/giwemotokig.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210901_255FA096858670A3.pdf
    • http://tradeweb.es/userfiles/file/70284300958.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdf
    • https://copab.tn/216mag.svn/uploads/files/movowagavewikuridazepamu.pdf
    • http://showdoimovel.com/files/files/21740335279.pdf
    • https://beldapin.com/calisma2/files/uploads/20088166798.pdf
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/fazirezowabuvapewuni.pdf
    • https://computerzone.pk/file/kinixewajuzomaros.pdf
    • http://khacvietlaser.vn/public/images_news/files/taxoxevagepi.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_off0000d5d3.bin
b28b180fe82c3aecdb655c87e0f0b7698504f34673e2fcd7c6b3f07b58093dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 18592 bytes
font_01_sfnt_off000106a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
font_02_sfnt_off00011eb8.bin
30786473210c9e2eb047d1d76a9e69be58cd2d0b9d576a691606e7626ae86042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 10600 bytes

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