Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f5b8dbaaf8b1af…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 20:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d95bbc7908f0ad4b40a8767c17358e6 SHA-1: c47f00ac6f00435b60b8525dbb0e0976f4538a22 SHA-256: 85f5b8dbaaf8b1af99937df5e4cd3f6040954197fa534d9f1e55e8f3d30147f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with techniques used to distribute malicious content or lure users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://boekenwinkelindex.nl/images/uploads/filakin.pdf In PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210910_4BDB1962CE2A76CB.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kamujegimediwerekodojesun.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/relovonifuxixapi.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/judofeveg.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/75836588765.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/losetavebifatojenovus.pdfIn PDF document text
    • https://hirurgija.me/files/xazabobewixado.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/22358480650.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/muxagupikapamevipa.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/muwovadizazute.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/98761763350.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pejasalozowapejumuwogese.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/gukijuta.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/66871397530.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/larama.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/powuvimip.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/59336565242.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5d84d46de54ee5c0c91667e13c863da8/ranulukudujobopozo.pdfIn PDF document text
    • https://blgjad.com/upload/files/tiwopikubajuvomi.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/kajutigofutigovex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tubemate+original+appPDF 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_off0000c0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F9 10632 bytes
SHA-256: 52d8f9ca79279595c323dcd62a0760a08b20034f63b73b95c3c4a8d233944b1e
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16856 bytes
SHA-256: 2aad7b7f762ae6edaeba0542a70f93d300e1a45cdbc7910d6ca8084631807736
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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