Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4296673575ad4a9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 06:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 984f62b70dc93e410b8129e75c997d5b SHA-1: 886e24b0b408305400a66b29423c72231b220765 SHA-256: f4296673575ad4a9c63408385327468ba780cb20c4770d2f5cb665f66b616186
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=fonelab+android+data+recovery+tool PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a85c574e9---87689990156.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210919010051.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/3743153597.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/38222542803.pdfIn PDF document text
    • https://kar360.com/resimler/files/lopasuvigunonuwapukegal.pdfIn PDF document text
    • http://lse.hu/userfiles/file/momodexuwav.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/11565411799.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/85740502171.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tutigegutu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/tijiram1631998501.pdfIn PDF document text
    • https://preciseenergygroup.com/media/91178601840.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/nesumiju.pdfIn PDF document text
    • https://best-label.com/upload/files/kivipikewonizonowuminelop.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zutamizesat.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/65197974717.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/96948155859.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/9063618237.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/38293134717.pdfIn PDF document text
    • https://rcot.org/userfiles/file/43220282906.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454ee4cdadf---3059967417.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/xekozoxe.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091319041373499.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/wuxilivu.pdfIn PDF document text
    • https://andrejc.si/files/file/gotilegewatitoladegibomaj.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 18120 bytes
SHA-256: 46081a1d2111541924685707efd6d6f5b2f26df3dde97a1b60aaf0788dea52c4
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10492 bytes
SHA-256: 15a5f31ea7311f9995870f53538897930c59f795c2981ed037e1a288d154d76b
font_02_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1