Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcea2eb8dfd2e9c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa0c80d3aa52b010c6c0770c5bf06c03 SHA-1: 4ca1139381653b638634b8370a6f4aa370633b91 SHA-256: 3bcea2eb8dfd2e9cc2958cbbc8d6eef15030202d8f8a63a4b71c4c438e418bf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://maschimaurizio.it/userfiles/files/kuxepelapodasetatarore.pdf
    • https://dalyanestate.com/userfiles/file/43627728117.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e787b3e593da409628273e8a828178ce/321510780.pdf
    • http://aescantabria.es/upload/fckeditor/file///rajapiran.pdf
    • https://rubfila.in/files/file/kotabomiso.pdf
    • http://kkc1.org/htdocs/cljr/data/files/kavatosije.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/pulaxerilezofetajim.pdf
    • http://royalwedding.jp/images/blog/file/78678479019.pdf
    • https://celebicatering.com/upload/ckfinder/files/vevololebutejefezidur.pdf
    • http://neuchina.org/userfiles/file/tugokaweritegavimofikovom.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/82874302219.pdf
    • https://hkparkkonutlari.com/image/files/wibulafofexujojat.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lemotivudof.pdf
    • https://toocapen.com/files/zowumovekorifusetiwiz.pdf
    • http://energyexcess.com/userfiles/file/xapedolu.pdf
    • http://ros-audit.com/i/up/file/dibojetaribupaju.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/82532496392.pdf
    • https://gdwtechnology.com/fckeditor/file/
    • http://cuspsurgeons.com/userfiles/file/30196972575.pdf
    • http://rulife.ru/ckfinder/userfiles/files/72609986948.pdf
    • https://letajicikoberce.cz/userfiles/file/lokugulagoxejeb.pdf
    • http://domoticasociale.it/immaginiNewsletter/file/83248535607.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b31d946e---93687577527.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=3d+live+wallpaper+4k%26hd
    • 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_off0000b82a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 16792 bytes
font_01_sfnt_off0000d03c.bin
5e3b27fab52be33660cf7f49facc232dda122187388a6a64a26c6f56dd00daee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 15948 bytes
font_02_sfnt_off0000f94b.bin
c95b14ea2852f759380fa6571003adc88c174d9bd9d6c52f03350aba60ca9246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 10292 bytes

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