Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b9548ba0109ef4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 03:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d811083b56fd0b1941714f59434e9bec SHA-1: f88bd158d9bed86cbf796317601920b6a2adbf3c SHA-256: 45b9548ba0109ef4e40a1feae428a72ab28e01e2008256aab21ee3cedde144b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it acts as a link farm or redirection mechanism to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://wastran.ru/uplcv?utm_term=hiit+and+cardio+workout+by+fitify+mod+apk
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917185119.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432ee36382---60758972983.pdf
    • https://godahoian.com/app/webroot/upload/files/46235629702.pdf
    • http://davobio.com/upload/files/kifekuxojabadebawodimumi.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/3904400874.pdf
    • http://www.centralperdana.com/file/jigafiwawoxifitomasolalom.pdf
    • https://peintures-descours.fr/fichier/files/28295613509.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/85082304594.pdf
    • http://svaz-podnikani.cz/files/file/jonasekixukud.pdf
    • http://advocaatindex.nl/images/uploads/vugowavolupomebawudelepe.pdf
    • http://ingmontagna.com/userfiles/files/redovixoninivokale.pdf
    • http://syntra.pl/userfiles/file/54053034215.pdf
    • http://xn--e42bt3l.net/upfile/files/murofisa.pdf
    • http://illinoislivestock.org/userfiles/file/lavojepaxefosixi.pdf
    • https://radekslodkiewicz.pl/files/file/xoxorux.pdf
    • http://techscreening.com/userfiles/files/newogewusaremolotis.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/makubidexoguvov.pdf
    • http://namkhoabacninh.com/images/files/rotizezisunusazedor.pdf
    • https://lean-ds.com/upload/editor/file/nixutugar.pdf
    • http://fanghsin.com/uploads/files/202109061642186845.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1barudihrek7ugjjaqu2r2tji1/sufixedikilesovaj.pdf
    • http://nationalcoopadvisors.com/userfiles/files/jazowataxutodetaxeneja.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_off0000b454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB454 16792 bytes
font_01_sfnt_off0000cc6b.bin
344f19e344af4d81ecd037221475cf06949a1c1278f71a8dffd9ba01860dc9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 10956 bytes
font_02_sfnt_off0000e59c.bin
9cf009bc508dc36bd4f40d2cf3b6eacd933eea37e5d834a2000b2cfd22d896c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 18344 bytes

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