Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f4671fff672bb8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 01:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 299117efe8f0bf9b0117d7d66137e985 SHA-1: 2da0984d10a3c13dfa239bb2b071f14ca3038272 SHA-256: 07f4671fff672bb8268b9b77b14c41cb9a62036ba98d0a7d5090b847d41a5a5b
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URIs, one of which points to a raw IP address, indicating a potential attempt to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests this is part of a link farm on disposable hosting, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://140.121.125.49/ckfinder/userfiles/files/20210907_073317.pdf PDF link annotation
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/sadupujonugugefa.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/lafozusegaxoxaparom.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zajogaperokodeb.pdfIn PDF document text
    • https://renteci.com/imagens/file/solutepa.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fekinusageturaweresef.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risuf.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/napefikinan.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/67668705303.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/jejuxelugozegutisugalano.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/76730256082.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabakizifixopedobuwigaru.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/tapizikosikupa.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/88400952961.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/masitulogusabexizatatu.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/nutuwepobipuletapenogi.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pamubepisemabumukas.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/76174784623.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321340539.pdfIn PDF document text
    • http://minipit.com/data/files/45261331991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=five+nights+at+freddy%27s+ultimate+custom+night+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/gubomijexuxotasan.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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 11300 bytes
SHA-256: bc15c18202f2fef5a8ae52381b8c298e1699ee398e8f23d4aed21757bb249867
font_02_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 17148 bytes
SHA-256: 4d563a0f358c967d0f9028a31bcaaea1f3a4c11c1bf2190918be039bc64df8c1