Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1a58b3b77038bc…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 10:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85b01cc3ec48fc716e858969a924a583 SHA-1: 84f51eddf65c4184f704079722596be3a1c3e420 SHA-256: 1c1a58b3b77038bc6c73f31b6cdc4cdc0ebecc121a7c60be3198f9e813b9aef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no executable scripts were extracted, the presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests an intent to redirect users to a compromised site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the links as a tactic for obscuring malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://performanshost.com/calisma2/files/uploads/wavakuvegimop.pdf In PDF document text
    • https://luckyfood.itweald.com/uploads/files/613e3f2c6d6e0.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/vixedegogevoz.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/83475516850.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/moxibomudoso.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/39260355667.pdfIn PDF document text
    • https://successalpha.team/upload/files/lodixulijawot.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vetibeju.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/gexolijuzudite.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2ef7471d0---19995517118.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/gevasafejazapubixok.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/4383603676.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lobazakofibavusemejumi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/5157120659.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556b3eef9e0---dejulugazivijanupudola.pdfIn PDF document text
    • http://stl-hk.net/userfiles/22251953689.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/21710007693.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tilajen.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/46365988892.pdfIn PDF document text
    • http://beta-rc.com/upload/files/7738579737.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/38763509019.pdfIn PDF document text
    • http://jaqalsports.com/files/file/26382293212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lesbian+kambi+pdfPDF 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_off0000ad1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 10484 bytes
SHA-256: cc74f82f65f1bfc81b9790bcb950464423da8784f7d5d5e76dc2f02d490272c0
font_02_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 15260 bytes
SHA-256: d2cd55ed9bc2e1a0fc49927b4ba7dfee69a6887f439b37550d9ac87cbf145cef