Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3566cec3d117a10…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 01:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 658395960a7e2b2cacde9114448de98b SHA-1: a825da7a2e90bee6d2aea19b598965d3fbc2338b SHA-256: d3566cec3d117a10228e9df363b9422ba1154ba7d96fe9dbfc5c7db1dc0243e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URIs were extracted, pointing to potentially malicious domains. The document body is heavily obfuscated and appears to contain no user-readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=en+iyi+sim%C3%BClat%C3%B6r+oyunlar%C4%B1+android PDF link annotation
    • http://pokeocncafe.com/uploads/files/tiwotusasenolukoxenun.pdfIn PDF document text
    • http://egitara.com/upfiles/files/kasigaxosaluwutuwotop.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc587cef89---jejakagatiruku.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/ruliseg.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab5e4c455---fulipokimexuwez.pdfIn PDF document text
    • http://grupophi.es/uploads/files/50452182435.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/jetalipexojapexuwijug.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wibokobaruwuwobewikagav.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/furukositixiwulige.pdfIn PDF document text
    • https://upaspor.com/resimler/files/valegitavatiwabuj.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/9373276020.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/55103803488.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/85331088871.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/80795973558.pdfIn PDF document text
    • http://rotang.net/userfiles/file/22883816324.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/17464004322.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/pekozonizonevezej.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kesulexafabiretuzunegize.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/38063497933.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/58302866352.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/lowapevibegarawofemeg.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/56126204904.pdfIn PDF document text
    • https://profesa.net/userFilesfile/10642275848.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/83987460386.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/84705635913.pdfIn PDF document text
    • 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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 18236 bytes
SHA-256: 63eab480e77df51b949fdc9bed6364b7f1cfc5b436ce9fed3671a41fb9fc5fba
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 10928 bytes
SHA-256: 019a2cc0eae181fd5d6b7ceb762d0b3362d0923c8d414526ccf0e834eea22655

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