Malicious PDF — malware analysis report

Static analysis result for SHA-256 852d3df9e3bcac72…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 00:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10865f5ccdcfe31b4898ab96bb3770fa SHA-1: f0f350f8070af6944203ea97fc1af4202e740abe SHA-256: 852d3df9e3bcac72a882618066b3168bb560a745af3c2d5ca578aaa62376bebd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file hosting or content delivery services. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high concentration of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=sreekaram+movie+online+watch PDF link annotation
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mebilifuparorew.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/wuginadenadom.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/34206208446.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/xavurejurutuxifigezofo.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/8607918074.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/kanufiwovisegimirukixe.pdfIn PDF document text
    • http://aimic.com/userfiles/file/49801965067.pdfIn PDF document text
    • http://df-2.de/images/daten/file/95497807391.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/wisopi.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/9584844263.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/21404941086.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rosabasos.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/bokefegales.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/fusewedorevuperujus.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/11054774463.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc7c9f9dd---jixivuxoravilokow.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/nubafilulesofuro.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/89651124172.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/71678022284.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/45069229334.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/67536441410.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/785315676130d1c43c2b7.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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10644 bytes
SHA-256: a0dcdeabe94bf0d96e4a6daf2c0b39161c3d889c242309517f306328310f1cfa
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 17804 bytes
SHA-256: db39cc7480f261103b82a7d23de9aa73bdb98a92f98e0a7be1a50a1cfd005a16
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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