Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c73bac1982c02d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 17:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: de8c5f5a25481ce5e7a7d681302a0adf SHA-1: fde48628eab74e87657da515862ef84470c5fef0 SHA-256: f9c73bac1982c02d5d862ff4785ec847f3d06db66a9bfdb6c3c410cde97f6207
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://files.ibiza-ferien.de/file/67959308842.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/73569840838.pdfIn PDF document text
    • http://araratmebel.ru/img/file/legatasefebaguvivor.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/88649636369.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/pupagoliv.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/29762201246.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/tajilarafonetujavin.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/bewelevakuraw.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///79376307091.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/jaxevedozorogelis.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/5403213684.pdfIn PDF document text
    • http://boxethai38.com/upload/file/fovodapaxujusidekesute.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/wupuru.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/6268755793.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/nelakabo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89068398508.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/ruxujolo.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/ligon.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/xakaduwada.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/noxekudi.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/bigiraredabumi.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/84007363388.pdfIn PDF document text
    • http://ijfbn.com/editor_up/vowimiguduzosu.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/lolusuvobarinenonoseram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=swords+and+sandals+playaholicsPDF 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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 10656 bytes
SHA-256: d0ce36bfb0bf061e5a905f8b4e19112b5c00937fcbb0e521df3d600f4230fdf9
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 20232 bytes
SHA-256: 6b1a0236ff95d29cc155b17202592d0edeeb702ac39cd5bd3a0dc6830d403572

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