Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c436b90437910eb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 16:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ec5ce3898388efe76ad9321e1c7fc81 SHA-1: b43adc8381993921c2d317d50a8d8b85ed52829d SHA-256: 1c436b90437910eb43d4b606c77029c472f302f0126a56e7e85e5898c1003d25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=ghost+detector+app+android+real PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/jazaz.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/zudikulafe.pdfIn PDF document text
    • http://qdjshg.com/files/file/lagibavis.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/96650883684.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/50771524472.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613805441bcce---41936490150.pdfIn PDF document text
    • http://ccadl.com/files/20210913030753.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210917071218.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbeab5c5a0---popuwidovuba.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • http://warehousetraining.ie/images/26248313908.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/44949876582.pdfIn PDF document text
    • http://93564497.com/userfiles/naduzagugefanesudazawer.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/60784488190.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/86038914381.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/7506532935.pdfIn PDF document text
    • http://czminghe.com/upload/files/tijanabev.pdfIn PDF document text
    • https://totounited.com/contents/files/pefubonan.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gipawixetefinavub.pdfIn PDF document text
    • http://nemalipics.com/befowivunuxefadiwonizof.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vodijowimekal.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210915231520.pdfIn PDF document text
    • https://red-adlay.com/upload/files/posibetijavokovozurol.pdfIn PDF document text
    • 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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 19612 bytes
SHA-256: 9ffa05e5009275e00672c5c509215664d55f48ab27f03e6c796902d96af6bb5f
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 10652 bytes
SHA-256: 15371df37dd2fb8e116a69525d04a435b53f2cb82944d4247804e86edf9194f7

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