Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d701bc616221be…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 22:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f72f2dfb62035b63527dc1b0714d7d SHA-1: e88cee3fdfa9fbd0fabff81098ca79f8c0ceca49 SHA-256: e7d701bc616221be6c48742322973abf92b0d6a70059a6abdc0ea841dccd131d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to prompt the user to install a browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect the user to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5842cff3---paxegepa.pdf
    • http://esrafisek.com/images_upload/files/nimasemoribiva.pdf
    • https://tecnicadovolante.com/images/file/lutem.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/81330262872.pdf
    • https://baglab.pl/galeria/file/47753769643.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/30439061833.pdf
    • http://richardchong.com/userfiles/files/tewubijijelapetuwelalare.pdf
    • http://abw10thstreetne.com/uploads/files/jamekapexegog.pdf
    • https://havadisname.com/upload/ckfinder/files/25079392014.pdf
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/faxulipijajorewixi.pdf
    • http://aucoindeshalles.com/menu/file/lesapiw.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/goxipenejuvalixiteves.pdf
    • http://ttmplus.com/userfiles/files/83701224439.pdf
    • http://goldnumber.info/userfiles/file/9138824777.pdf
    • http://tandartsindex.nl/images/uploads/70123109356.pdf
    • https://liepasmuiza.lv/userfiles/library/zabuwexiv.pdf
    • https://dentalrud.com/userfiles/file/turebisujugasojurajome.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/gedaje.pdf
    • https://bloomeng.com/uploads/tunujejonofunonitigitiku.pdf
    • http://koslita.eu/ckfinder/userfiles/files/13444879519.pdf
    • https://evermoral.hk/upload/file/1630958810.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=make+windows+bootable+usb+on+android
    • 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_off0000e6f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 16792 bytes
font_01_sfnt_off0000ff10.bin
a19a968ffca86fce46c9bcff279a1c7cae807b204c8614706484ae3d57e0ee99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10652 bytes
font_02_sfnt_off0001179b.bin
96b059caf848da4e0b55b277e35ab6c918abefed0244cbb55a774971a10aed33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 20280 bytes

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