Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c4f9f8824de291…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 00:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ad31f1ee10e2aad063e4dc011bb613c SHA-1: 08b8982c9a9305b5fc8d729b2c557909b553def6 SHA-256: a2c4f9f8824de2911f99bfb17d1c47009e5e06ea1bb9cf2fe2f27d2c66ec5fdf
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. One URI points directly to an IP address, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hightopeducation.com/cms_uploaded/file/99297339520.pdf In PDF document text
    • http://vasa-project.org/fckupload/file/wafevejunagofimapi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/80911010524.pdfIn PDF document text
    • http://th-hl.com///upload/files/81641898297.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/99465990158.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/14212752861.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dozev.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540becd1312---84404131189.pdfPDF link annotation
    • http://studioguagnoni.it/userfiles/files/60231940023.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/xeruvagezikovuvir.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/73543416491.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/xuzozirimu.pdfIn PDF document text
    • http://thedreams.cz/files/48707748544.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/26685475932.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/judizafujovam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e16b76bc0---7018139538.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/36351386198.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/vuwofere.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/14195327888.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/53960550212.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/86415747159.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/51549899963.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/bavosu.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vivojibofajemoxosujik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=angles+in+a+linear+pair+are+supplementaryPDF 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_off0000b099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 16444 bytes
SHA-256: e8bba81ef50be6befd26d88f40041fd4fad2851ba5f759b748e18389af9ac317
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10672 bytes
SHA-256: b00c7fdeac0011920a417755fd3db8ae10cf8426cf5a95a5bb913a8561c522b8
font_02_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1