Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cbe50a42baafe5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 12:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 601892c701b3b28cab2193f0f64b2b03 SHA-1: f1742b82a6f3df06def88e9e634c9a24b8ff0292 SHA-256: e9cbe50a42baafe5a1e2488516e782bf2f035f397eb73d48f0bef48201253a46
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of multiple external links and the nature of the heuristics point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/7155559159.pdf In PDF document text
    • https://0a3exp.com/upfiles/editor/files/41296178896.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/13249168446.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/28659349974.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/begonomananotanarugumo.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/28892558113.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/norer.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fozajuwemodukuze.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wixotojosuxefirixopofetix.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/10001224124.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/migibitegabupotobubufado.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/98436647469.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bedunomosugip.pdfIn PDF document text
    • http://tfforming.ru/d/files/58532093202.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rotazazigezopev.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/77948227102.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/muponizukilozenikixul.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/34516154866.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/zaresafusatafinodufevoga.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d654504f82---89503375467.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e356d4dfb---taxapuruwij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+draw+manga+guns+and+military+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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 11000 bytes
SHA-256: 12724ce1b7d599c2c5a0c8b19702ce94c93ff0e9a055cd26807e28f116027c7b
font_01_sfnt_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 18352 bytes
SHA-256: 9706c14161cd7498a4039c9680018ae6bf694127e36dd5ce03483cb860e2d45e
font_02_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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