Malicious PDF — malware analysis report

Static analysis result for SHA-256 63537349a0decfe5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c08d72a0ed17a1f16abffa574f29ba8d SHA-1: 373fcb03906631a363c9feea13badc4aef159004 SHA-256: 63537349a0decfe55ce69f6d86886444d004794e5b6a0e674327a9bd77a0a05e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to suspicious domains, suggests an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://flammerouge.ch/userfiles/files/24170611994.pdf In PDF document text
    • http://dubilex.com/userfiles/files/wepavozijoromakufalav.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/72187990863.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/6281995245.pdfIn PDF document text
    • https://micsys.in/userfiles/file/16446035385.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137841c01730---naxawir.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/rofumodarewegunedaloxulu.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/vilewopugidib.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xumefazaviponit.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/jabaropel.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pezebox.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/57490239194.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/tisekelobil.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/71d00d7941a6340381708befcb227bfc/9781918880.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tavorupirepefedifadakep.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/73262609393.pdfIn PDF document text
    • http://standdominica.org/files/files/14350153501.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/patokarujimebuwogo.pdfIn PDF document text
    • http://idcla.net/upload/files/89487281912.pdfIn PDF document text
    • https://botroul.be/uploads/58388777281.pdfIn PDF document text
    • https://premiersuli.hu/files/files/mopidivajavesor.pdfIn PDF document text
    • https://huanghecables.com/d/files/kujitotixolumuporexezoki.pdfIn PDF document text
    • http://recrute.fr/files/files/dovezute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=my+forever+quotesPDF 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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10220 bytes
SHA-256: 224f5421be6cab70b6b2314c305e02b8b3a59b90f3e971f99d2521c902c5618a
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 17968 bytes
SHA-256: 866ae496e222096e18eb2a7c10f3e7d2f8636647acee4fb2421c123208ebdb77

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