Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78d06710dc544a3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 10:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d7e943792b40fabc953b8a6e557c64 SHA-1: 70c8301d161975bebac18d134b8e97406b9616be SHA-256: b78d06710dc544a34fb7126fc0a38b7f854baa5bca46a07c5e47df77079dd561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pogologistics.com/ckfinder/userfiles/files/vuzavonula.pdf
    • http://gsprojekt.eu/userfiles/files/18372649838.pdf
    • https://lecachet.fr/docs/files/sifutaratobepugurosokozo.pdf
    • http://mfcpavpos.ru/file/60933743458.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c2aac90be1b600c88ce0cd0b5b3797a0/tavuriviji.pdf
    • http://nigerseedindia.com/uploads/nebedigafobixajatonufu.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/gaboxojiwijovodoponu.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d027f94f843806a2d29236b9acdadd1d/27684707416.pdf
    • https://next-engineering.com/userfiles/files/xibesumibatebuvuzerowad.pdf
    • http://tdsns.ru/userfiles/file/44072555261.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/jusomes.pdf
    • http://damutech.kz/upload/2021/09files/210911191928583122p0eig.pdf
    • http://aaaexpressac.com/userfiles/file/junizonimixip.pdf
    • http://kamakuralosgatos.com/uploads/files/tikanimoxugajikeg.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vitomavox.pdf
    • https://ijp2.com/contents/files/vimofodetula.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/kaniwega.pdf
    • http://m3hotels.com/userfiles/file/vegugupizejajijoguremu.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/95083149291.pdf
    • http://sva-jeanroze.com/xmedia/file/7035390658.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/kovanenelemirazetujosunum.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/82386623750.pdf
    • https://burstallconrad.com/editor_files/file/wotimurogu.pdf
    • http://metallpress.info/files/66962650417.pdf
    • https://quizai.com/uploads/files/bisedadafebijuk.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/58150788833.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+11+official+launch+date
    • 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_off0000df8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 16792 bytes
font_01_sfnt_off0000f79d.bin
ac1239739fb79ebcebb05ae02e9a6acd76c88fc64c8c3055bd0273b45b3ea41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16576 bytes
font_02_sfnt_off00012298.bin
0ca522b00b0a930156f5024a47c11d440440adfaf4fbbb7c64ff19748858a0b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 10536 bytes

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