Malicious PDF — malware analysis report

Static analysis result for SHA-256 859e0f5c6ee57ba2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 429bdcee292edcdcee6be37b50db866f SHA-1: a2eb7bcc15dc68186771c67f066c6a866f8bccd4 SHA-256: 859e0f5c6ee57ba2d2b9a4b97627eaee76f86dc1ec1a91ee6be4c53e444aaa4e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=pes+2020+raw+file+download PDF link annotation
    • https://valerart.com/ckfinder/userfiles/files/86643116119.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/zugasiz.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/doxudiwapavenilisori.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/dudezivawonavotum.pdfIn PDF document text
    • https://comfort8889.com/upload/files/zanija.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xolizurasoxiwafewejo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/limirometugodawuv.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/garinasadedavoz.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/11950290484.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/98182803358.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gedazegukus.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96639640366.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ferolepuxutevubofilaw.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/7706664171.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/70116374191.pdfIn PDF document text
    • http://only-svet.ru/upload/files/45164654470.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/80023794213.pdfIn PDF document text
    • https://felicityokolo.com/file/71295077479.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/lovimugi.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/pufavulixadutisajor.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/46551619433.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/47937641052.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/65410097292.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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 16724 bytes
SHA-256: 7ae813dadfd835fe5d7e11e8fcc34e65cd36bcad34d6fb488eb54c6d85e00d87
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10580 bytes
SHA-256: b64f661321d24cea6c20adb45166d83871ad4b3181bd753588375339c16075df
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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