Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa16024bd65153b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 02:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15ad128c842b981cd26f9ba877800a5f SHA-1: b968a2a0f33dc8b0996b788c51c51b11988afe9f SHA-256: 8aa16024bd65153bb95cb7c2c47128e78d8fed710d127ae4d5196ce25cf5ebf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on external domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eastwoodfamily.net/userimages/bigowenilebiribox.pdf In PDF document text
    • http://nomorecpapmachine.com/userfiles/files/wiselowubisudab.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mijedipavejedijami.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/mowijevolafotirusasokozub.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kibix.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/99517014808.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/jolatagirefojememu.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/gupubugefisinef.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/47995870188.pdfIn PDF document text
    • http://fitviewer.de/files/file/99308989050.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kovujoxuganixirove.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/dojanirebofimiparos.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/voboberanefosutomegu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/99699873729.pdfIn PDF document text
    • http://domosplast.hu/files/file/93337232665.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fawilupoxavovomekodobaz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/38098410055.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/47735938246.pdfIn PDF document text
    • http://horvathortho.hu/tmp/dulemabelomakagoti.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/vuvopaxemakufoza.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/32472199994.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/nowititexifixawexipese.pdfIn PDF document text
    • https://blgjad.com/upload/files/40287198277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tamil+transliteration+for+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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 15576 bytes
SHA-256: 48cf7e883e5af4e70196eb87457a038f744c1e0fc254fdee83764f80e4e647f5
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10476 bytes
SHA-256: 2621eb9b73bfa1ed54661ff16aee51284cfcc765024a6d97bc0998cef4d5d0f4

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