Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87cff5f9850022d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 15:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fa5ba5782c967364194fee3d295bc7c SHA-1: 71383f13ec661f8cd33967c382ce1dc57bbe70ba SHA-256: f87cff5f9850022dea4170aac8715adb1342d0368d512c5c70f1dea2ef2ddc86
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, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy sites. The primary attack pattern involves directing users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141825919bd4---jurozeboxovibakisag.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/80435873200.pdfIn PDF document text
    • http://pasted-radio.de/web/files/zemamajunimarilisuxelum.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/5036695358.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zexojutazi.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tegimovozudopi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/lazivunawawe.pdfIn PDF document text
    • http://devveb.net/userfiles/file/92842997493.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/69897371486.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/56927935822.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_2CDAD56C0968D54D.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/52014866761.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144506b68303---69697254628.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/borokepuxegenomewule.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16111066377.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/88670192921.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/96154611044.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/52169046144.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/vukememogi.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/tekapuzijamafokaxevejava.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/589307039.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59492733298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lock+screen+service+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10336 bytes
SHA-256: 66d2c6576bec78927cb9573c7374c37349eebd2f49dd6d180a2a7a6a110c21c9
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 18472 bytes
SHA-256: 92d99cd8e4738ceb1d32e8919b111e0c52bf46d840ebd19de28dfca40b3b6f5d

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