Malicious PDF — malware analysis report

Static analysis result for SHA-256 167bc157b4a3f8d8…

MALICIOUS

PDF

64.0 KB Created: 2021-09-13 21:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e59edb4528f8d83c04218d381e8c293 SHA-1: 4b5b30cce33f593c389df9d3934b161da94e8c08 SHA-256: 167bc157b4a3f8d81eba4b5294436f9213263b80a153c82f795a2929236f0b53
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious content, likely a phishing lure or a downloader. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

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://siripanyalamphun.com/user_img/files/59048271188.pdf In PDF document text
    • http://stellarp.com/userfiles/files/xutobor.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/sibubivabidoxumusuzigowuv.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/58001148795.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/31686661992.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591924cb73---40062697575.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1852f5c0f4a06204bf13595b650ab975/4691243326.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/24834493451.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/vaxaliritadivamutataj.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/37556745901.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/serobavipazev.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_B2ECF05D41EDF7BE.pdfIn PDF document text
    • https://eslms.com/userfiles/file/fusopugumexamag.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210908114709419.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36614285028.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/medefowubekema.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/jepevu.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/30468599345.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/70268466041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+5+for+android+requirementsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 22652 bytes
SHA-256: d083064eb210102bbc919b94b9f3e221f8a618d8a095c11be8f57d52ef0e00fe

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