Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79001bd82f815e8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10a16fb2c8fa5199062a711e40fb2ca SHA-1: 9c505321c3d537d5924093ed0c983272310b2a90 SHA-256: a79001bd82f815e86356e3089f97603226cb212549fbd6e9fcb84344e93c5081
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, including one that appears to be a lure for downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=download+game+clash+of+clans+mod
    • http://kunbot.com/upload/files/wunawile.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/35864364514.pdf
    • https://zemiigori.com/uploads/file/92500177014.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/misidadesod.pdf
    • http://degrossier.nl/uploads/file/57319788903.pdf
    • http://siamsankyo.com/Uploads/file/76379696837.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/katelilutolanugagulegix.pdf
    • http://mirai-kankyo.com/userfiles/files/19849396021.pdf
    • http://dainindo.com/Uploads/userfiles/files/89777324646.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/vezekuzopamakejexexot.pdf
    • https://bursakaynak.com/userfiles/file/lutez.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimij.pdf
    • http://immobilieninvestors.de/userfiles/file/77901053277.pdf
    • http://leguido.net/files/sedezedemofoxivuger.pdf
    • http://dailygiasi.com/uploads/userfiles/file/23868170859.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/dedemivo.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_off0000c358.bin
d2013e0906ae1fa5f010e1830723d50c3d7f8bbecde384f2e3055d26e95a970e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 10720 bytes
font_01_sfnt_off0000db9b.bin
83c695e6d9a2bd567f290369cd4aed8586135132a0d924ab24d13fa5734f5281		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 16312 bytes
font_02_sfnt_off00010536.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 16792 bytes

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