Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75e8536cd75d1e4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 04:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7da1bc7c46049ec10ce77c67963c512 SHA-1: 7472e38a69c76cb7dcb31b37cf230e26270b39f0 SHA-256: c75e8536cd75d1e42bc3a870b45cd22da12d29c117116fccd7c7b909bff939e6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous distinct hosts and disposable links within the PDF structure, as identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution attempt. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://perevodvnegiloifond.ru/pict/file/85798562522.pdf In PDF document text
    • http://devitohomesorlando.com/userfiles/files/fusetejemivizerinerodulo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692fc8251---rofetewubefupu.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/24622520323.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/janivikizusujona.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/56468414170.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/xolevo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/vewowimesukabugilugiforop.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/99339869742.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/vusunobenulasabipiw.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/58411564580.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/25981383567.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139487c6e88a---mujulaforuvubususe.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/76574822702.pdfIn PDF document text
    • http://prota.ru/upload/files/kolotabawikor.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sopironazujuliwezi.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109071213501624.pdfIn PDF document text
    • http://markone-tools.com/upload/files/benizesolupuwadituwarotip.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojugozejabovaxagepep.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/serugozogutexanitefipisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=small+build+ideas+minecraftPDF 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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10832 bytes
SHA-256: e12d414cb98569500793967e43d03d6469e190781585aff5231bbe8727c6a70f
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 18104 bytes
SHA-256: afa7c8c02381b90c17056b32e868adf46172328ebd886af582c8648a3ec5873f
font_02_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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