Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38e08a0d54849bd…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 17:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec8673cbb41fb434759599ca58eeea67 SHA-1: f0e0e622e9478746c1a7c46bb7920a4a33099469 SHA-256: c38e08a0d54849bd47056f8778dba638f028ad1514cd7014cd91cb0ef7f6c790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a pattern of linking to many distinct, potentially disposable hosts. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://lerucherdesanges.fr/userfiles/file/87205418083.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/luwometutab.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xafodamokibagegobudopewib.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613613718ae11---lideri.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/43048516356.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379158d1ef0---ridopuso.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031216153934.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/voxalojetebukikepegino.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/30823499079.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/63731923984.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/10724191789.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/49891223149.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5906180743.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/birusixojezosazaje.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/66436767483.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/80794433447.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109082205235262.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/13908775661.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/55157044737.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fodekoj.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=saints+emoji+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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 14488 bytes
SHA-256: 7fc00f70789cdcf2f276a452f3d5adea5bcd60f64ee815e6f75e960050646811
font_02_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10568 bytes
SHA-256: 7c69777f0a1da1c99bb1004e40faba63bfa0c77551392dd4af3d4d67adf6f522

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