Malicious PDF — malware analysis report

Static analysis result for SHA-256 408715f0b43e97d1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 03:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae494bb82af679c15c4a02e82e4568f2 SHA-1: 8727436a7ef51e01f282deaaefec956d3ac5a62a SHA-256: 408715f0b43e97d1a93bed24b78da3e292be10912b4f4f362d7ddd6018b76f11
124 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 structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8121

Heuristics 4

  • 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
  • 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://rockhousemethod.com/ckfinder/userfiles/files/podalaw.pdf In PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/13707624800.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/67575612743.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zokawubigimek.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/dezemavako.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210908044419847.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/98839051848.pdfIn PDF document text
    • http://suurelepa.ee/data/file/kovaxigigemogono.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/77070415513.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/57936466450.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/43254490764.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/49654396745.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/52687284561.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351a13eb85f---fikovetunuwagisekasasorin.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/92091898834.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903023320.pdfIn PDF document text
    • https://plasy.com/uploads/file/dozel.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kujozaxus.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/rokopelizobowujusurus.pdfIn PDF document text
    • https://bataretak.com/img/files/file/desizajapemabufezeje.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/43398821469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mp3+convert+to+mp4+downloadPDF link annotation
    • 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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 17980 bytes
SHA-256: 1864f8616c83a6b1c8fe28557e264838531b7f951709116b68fd6d6db47e2ea2

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