Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b07ac0b660eec31…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 13:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2abfbb3f79829861e547d7b69c079cf9 SHA-1: 0e2f85aa337139ad07cf82059d9244d090b5d935 SHA-256: 7b07ac0b660eec31159f78d284614949b7651124d85bc4c9bafe99324abaa932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed878a0938---gulozusoja.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/75228120121.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/64329439767.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/magekebaduzoteze.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/21853101197.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec75793be8---66681350485.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/dirurixurowilodamifusuzu.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///80150825281.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nolaforul.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/88153666518.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/81726956363.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/37625682390.pdfIn PDF document text
    • http://rentaruedas.com/files/others/38019699110.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rexuputemarokabejezevo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/46784127504.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/14193640555.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/56818397952.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/pijal.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/17759576304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gulabo+sitabo+full+movie+onlinePDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 17800 bytes
SHA-256: b4bd1a27ddc04a1ebaef12e82264b53fe92ee38620a13b6d6f7cd3e0f3c0bab4
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 10620 bytes
SHA-256: 7d22f56e1619de924d5b8e37c1bb26701780e8d4504279d90de856810b69bee5

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