Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9617431f8706bc9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 13:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e6947580fd3c441664cf2f39521fd0d SHA-1: aa5bb4d5f5b0c0e92089117969a1b09f9f53ece3 SHA-256: f9617431f8706bc98a92a540fbb4f443c6b22f87f7a64e584d47aa75d66a012a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7354

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://coretry.ru/uplcv?utm_term=how+to+write+a+good+thesis+statement PDF link annotation
    • https://www.profiemg.cz/upload/ck/files/bepigesoxalibivesazusirem.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89572262746.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/kadevuwububazeran.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/23868587932.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jomagifezemuz.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lozim.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/44519476837.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kesujuturudasifilo.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/85186111012.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/37278941104.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jasabexegoxuvasega.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109070809057288.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/18347331619.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/valoraj.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210902143701.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/62781153917.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fukirakodod.pdfIn PDF document text
    • https://coil.hk/upload/files/7874724847.pdfIn PDF document text
    • https://atavio.ru/files/file/lanupejapinavogobitupupef.pdfIn PDF document text
    • http://www.celso.org/download/jofijugupifopenexisero.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/pixonulilurixuxonakapip.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/revovapipuwomeru.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/71614156959.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 17276 bytes
SHA-256: e77c09f80606500538bf0061b881f5b6dec6022782eb69db92f1d228d1772501
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10728 bytes
SHA-256: a25c2e50a43849436923f504ba7ad5c97c1dbeb2e3be1fb815941f7d6d4c75c9

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