Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9cd91c7024e9bf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-15 20:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4acd3933f2be05fcad70915a8d8799be SHA-1: e973396bb891269048b183d09b15dcbe13ccd222 SHA-256: 5a9cd91c7024e9bf9b43551a1874242faeabe2255a9b38263aaa7ebccc61353e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. One URL points to a game modification download, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://puntolinea.org/userfiles/files/55018314840.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/gozarimitiwev.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/dikifov.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rogidasubifidixalute.pdfIn PDF document text
    • https://edarky.net/data/file/19571443699.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/51d40155910ee49797e397a5427377f9/75670773711.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/49097232142.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/mimivixodozavovidor.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/xovajulewigelejodol.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/mupobabiboxurevupo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081691b42d---furowuv.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/marifijevifudekazijivebi.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/waramilaxakenukak.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/657271990.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/73574652409.pdfIn PDF document text
    • http://futboltotal.net/images/files/doxojifopobujupexegudid.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zikanemoxoj.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/73139219016.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/figavupokevulinaduxo.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/45572353108.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/45473405453.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/73447442282.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/31164804077.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/24708844780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dream+league+2021+mod+apkPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 10760 bytes
SHA-256: c79cb5305ad6b94d3974d0b1170962d8368ab8a9536e24bc2bfd0b0d5c7f7668
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 18108 bytes
SHA-256: 104c3a322a81871614f69c112290d83385f0cd914786af0680723977f0284818

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