Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d430a7ca43139f3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 03:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7124c3bcd20934623ba1f1e732e26e33 SHA-1: 97101b48c862fa43e235016b7f4493b0e597e3db SHA-256: 5d430a7ca43139f39c79065e48d0ea0c6a4b2ab35b4e3c0fafc2aa497ec1e54b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or scam attempt. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically mentions 'free 1000 instagram followers no human verification' in its UTM parameters, strongly suggesting a lure for social media engagement scams. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thehouseproduction.net/file/26118150862.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/89882854806.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/16673309005.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161490fcb4db81---depiwatirezubavegijap.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62652039051.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed6f58e84---84239606252.pdfIn PDF document text
    • https://pixel.bg/img/file/safuw.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/11088566355.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/rijefewateresupavuxipon.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jefugitup.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/sexutuzi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/wemezarijukepowufu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/9253969919.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/16635378711.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913165013.pdfIn PDF document text
    • http://skomi.ru/img/files/file/lurasenikulimaxamifatuzaf.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/84061904358.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/48189268528.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/76201991647.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kekikofo.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/difenarosanusumamiborari.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/webipevibadobenejor.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/98841748713.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/notagumepujavenixekemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+1000+instagram+followers+no+human+verificationPDF 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_off0000ba74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA74 11188 bytes
SHA-256: 4e76a50bd228f8cbe480085416d4459e82e6916abe852559e0199f3a908f1945
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 15388 bytes
SHA-256: 7f73246dd70fffa3b6bfe3f004a328dfe058b40c41ef23f99a467e89bcbda5f0
font_02_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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