Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed1135c2ec3c261…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 16:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d782a1b86c139c13aa16269ccaa00ed3 SHA-1: 3296e6a7db6ff803e8b4a5f3f149f2472f89b9b5 SHA-256: bed1135c2ec3c261bdef1b97699afd284b8f15f0f524d2b6bd2b6fa4f965a5fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=tiktok+porn+download+apk
    • http://aliguoriarchitetto.eu/userfiles/files/1349166521.pdf
    • http://srs-budapest.hu/uploads/files/giworogajolavevume.pdf
    • http://kerekesvillszer.hu/UserFiles/file/gugaremefinagijajuxog.pdf
    • http://iwilldoit.ru/uploads/files/files/finas.pdf
    • http://avtokapriz42.ru/userfiles/file/ditatefagerudanari.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/57635705037.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/22865095215.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/rokiwuxabelovibiriwilugow.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/68487730315.pdf
    • http://curvesncontours.com/userfiles/file/87898789549.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/35609039814.pdf
    • http://tuyothuyluc.vn/webroot/img/files/15942229876.pdf
    • https://dongphuchuytai.com/upload/files/72357809288.pdf
    • http://studio-castiglioni.com/userfiles/files/besewiguferonireleroxip.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161440c9345680---wadowixobaror.pdf
    • https://camelcarpet.org/d/files/78350177999.pdf
    • https://cabsfromheathrow.com/userfiles/file/matozesuravotalumi.pdf
    • http://agisinfo.ru/uploads/content/files/kurepagumikogixakizajul.pdf
    • http://artsar.pl/userfiles/file/81268302372.pdf
    • http://tochalco.com/uploads/files/vadexom.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/kilonozaviniwipexewizo.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131b402c05a4---65547620348.pdf
    • https://sardavetri.it/userfiles/file/kozumoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afff.bin
6e486f9c5197081819eaee45760db9b07ea089aee5aaa931fb6468ca35a8bc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 15612 bytes
font_01_sfnt_off0000d6b4.bin
998a0f682c1ba8bcb3a5b48b7fd897756f896651019f0af430b35dad5f228377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 10228 bytes
font_02_sfnt_off0000edcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes

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