Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd694f4f9e6db4b0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 20:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a262e2fe8bf758b785a1d5e0080f2637 SHA-1: d14aaa4c30ed4e08afbfbb9d64adb7c0ca39e093 SHA-256: fd694f4f9e6db4b0a9c3a8903c024cb6df832f9cb549333380b7b2e8f2b11066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to evade detection. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://osc-pribor.ru/products_pictures/file/zatiluzusagalerizetoke.pdf In PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/90265635094.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/94388945396.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/xusuzekabe.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/87307826596.pdfIn PDF document text
    • https://novsport.com/content/File/nukonupazoli.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zexuxodifuvineg.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/sodegakumidunefawajisalu.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/13112930138.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcb4ac5ce---bedefugemuxana.pdfIn PDF document text
    • http://warehousetraining.ie/images/gutoposadipefapef.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taretujekufedatujede.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gudozupo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/94336769617.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/60732653702.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/49365096539.pdfIn PDF document text
    • http://cwesp.biz/upload/file/6878846109.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/bujunepas.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/weredibofaxezidosaxuket.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16310477708961.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/mujexeles.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/91862732682.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/48231498147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=brooklyn+movie+online+freePDF 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10272 bytes
SHA-256: 131ca5fa188a8ac3825b81156b70c158eb48517c9195d8d3dcda1aaef6afb1f2
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 17188 bytes
SHA-256: d6639e763f975b625affa0b4f3f8a1021276db4cd4b38ae026cbb663cd1f8122

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