Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1d1bc30e3bf1d4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 04:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 554c61c037590015f68ea6ce949cc03b SHA-1: 4d961fbf88ceda27b5d33c58d4e01d251676050b SHA-256: 5d1d1bc30e3bf1d43b4a2f44b00751982b47e2193d36c170c02eb17f6fda46e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=exercise+technique+manual+for+resistance+training+3rd+edition+pdf
    • http://claudiamelchior.it/images/file/48911742903.pdf
    • https://mehreganimaging.com/images/upload/files/65187332187.pdf
    • http://bukhatirhomes.com/userfiles/file/24673159803.pdf
    • https://eurosan.pl/user_images/file/bajibixex.pdf
    • https://musikkursus.dk/userfiles/file/38633657263.pdf
    • http://nuocmambason.com/upload/fckimagesfile/1aa56082a6624285f7344eb7da1d2c4f.pdf
    • http://aloisiquadri.it/userfiles/files/vaduvazanok.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090615841_762918547.pdf
    • http://karthikeyanjayaram.in/userfiles/file/4365641931.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/bapajapekunaler.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/61156750948.pdf
    • https://storycycle.com/ckfinder/userfiles/files/59194173072.pdf
    • http://leebyenghun.com/new/upload/board/files/tipivitimetatoje.pdf
    • http://burchiellati.com/file_fck/file/51756707925.pdf
    • http://veewood.com/file_media/file_image/file/sebizawasevazisarite.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210911_43A674488C4747B8.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910131314.pdf
    • http://ameshamagazine.com/js/upload/files/zawuxovalus.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/79180380349.pdf
    • https://euro-m.si/web/dokumenti/file/63847450650.pdf
    • http://alpinedelhi.com/userfiles/files/74811119882.pdf
    • http://nhakhoanhantin.com/media/ftp/file/libata.pdf
    • http://olgapolyakova.com/files/files/beliga.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_off0000dc32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
font_01_sfnt_off0000f444.bin
eacc40aa478b39085cea20b4367c5c94f8ed70a4b94ea1963818f766d0999da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 18696 bytes
font_02_sfnt_off000124e6.bin
d1d2e3c866dbbcad0414973f22573eb71d5a681d1912f5a7b78aaa21b531268f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 11568 bytes

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