Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc195c4c82c35fab…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 23:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dac5b66b5199c82dac131151fd971558 SHA-1: 6bf6f3ac2b9233b6cfa673bed10d3d111a85edd5 SHA-256: bc195c4c82c35fab128f0257f0efd945f14732bfd9569e932e179ea1e9bca311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, often associated with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=different+pokemon+card+sets+symbols PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/56821713930.pdfIn PDF document text
    • http://195exim.com/datas/files/77658585256.pdfIn PDF document text
    • http://glttek.com/userfiles/file/24917499359.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jezoxarulixudaxijofomi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0541a3c3a---93153010260.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/62344612759.pdfIn PDF document text
    • http://freestyler.cz/img/file/morutitatipitixi.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/xazawalogudewomajirunixu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/kilubojamapataxajejike.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kufesen.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/zipizodobuxidul.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/tatasobazotamedev.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/jugofevas.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/befavidexew.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/82585606875.pdfIn PDF document text
    • http://word.mn/uploads/assets/sazuwaxosera.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/gagewe.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/29891957045.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/63527798615.pdfIn PDF document text
    • https://tipresentoio.it/images/file/34847522039.pdfIn PDF document text
    • https://wrd13.com/force/file/90329972135.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/ziwunasesuxilomejireje.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/29381071140.pdfIn PDF document text
    • https://limadelimon.com/images/file/xakukuzizesupiponutixoxa.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/53542582703.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_off0000b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 11128 bytes
SHA-256: d3578d9b625b044ea662b3ddd72c5112c8d279b30c123f5d827f91a0cf615162
font_02_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 15704 bytes
SHA-256: acedeb4eb7fc5122685d02fff5ec7fda8d2da8eced699856c75935ffc980aedd

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