Malicious PDF — malware analysis report

Static analysis result for SHA-256 94133cf4b7034372…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 22:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b65ae5a36a692d2a8fafe3343e125ea6 SHA-1: 1c57a6061fcb0dcedb57fdc3a775d057a2b27a69 SHA-256: 94133cf4b7034372a9ba27d472c23eb70cd0e463f66c66e416e3f440307fbadf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious domains. The presence of these links suggests the document is designed to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=posta+fastweb+su+android PDF link annotation
    • http://www.patriarca-batiment.com/ressource/site-image/files/kuduparakukamo.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/82758061693.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/25214504511.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/85177163479.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/sagavulorugajabemogivoteb.pdfIn PDF document text
    • http://www.og2c.com/images/file/89083295260.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/96482349624.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/botoxukufokupumekunuj.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49199937810.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/efa569079a00e64f488cdf724fc38a2b/83978223060.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/mavezinenafa.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/39566056076.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/nobigupifufuvuzu.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/lepepox.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/gadagoniz.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/tojorusudiporajamubizetas.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kelufojogisafowapuwav.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/kifadivo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/6597150695.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/80087928348.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/88706058167.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/39357948136.pdfIn PDF document text
    • http://medica-brno.com/files/76158073118.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/bixuxom.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/balikujivimoxafubijekoj.pdfIn PDF document text
    • 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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 18180 bytes
SHA-256: 803ffe1ece5546f603e5002261c49595ca0cb0790dccba0aab63cf0470e8b0fa
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10628 bytes
SHA-256: 7236fda4f33027d8c84b3a54466fd557adf57f83a652e4d5cc56c32d6a9e7825
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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