Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6ffff0cba31642…

MALICIOUS

PDF

95.4 KB Created: 2021-09-08 20:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b9610c68f922615cebfb9dfa883b73f SHA-1: 359c3b0c5a1f0ee5a9de7f5ca15d098c4d53a959 SHA-256: 2c6ffff0cba316427cfe7b84e196d95f61b79fad2cee5fee897ef94ef1ba53bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves tricking users into clicking these links, which likely lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://ketchas.ru/uplcv?utm_term=aerohive+ap122+manual
    • http://vinhomeshaiphong.net/app/webroot/img/files/xewumipimotovobalilivu.pdf
    • http://eko-inwest.eu/upload/file/diwosiweweweb.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/21697919992.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/10292052344.pdf
    • http://smenergy.kr/uploaded/file/9741856826136bca100f95.pdf
    • https://ip-pharma.net/data/files/72054273944.pdf
    • https://kaplaitalia.it/userfiles/files/jibaxazuboxer.pdf
    • https://baobiachau.com/luutru/files/65510224640.pdf
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15978938420.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/kotugivododegimabawolifa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613808ec7d393---4474822080.pdf
    • http://jolanyee.com/upload/files/202109082116586235.pdf
    • https://washlounge.in/ckfinder/userfiles/files/potagojunavur.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/zexowi.pdf
    • http://rs-entp.com/upload/file/19682040163.pdf
    • http://freewest.at/dovavusegikawego.pdf
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdf
    • http://barsugo.com/ckfinder/userfiles/files/87034976891.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/25052637470.pdf
    • http://veszpremkosar.hu/_user/file/dogaviwosiwemov.pdf
    • http://gmicropilotes.com/uploads/files/40711041046.pdf
    • https://zlato-eu.cz/upload/files/19592640555.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/tigufe.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_off0001050c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 16792 bytes
font_01_sfnt_off00011d23.bin
61c7ac21fc0e6e30aac25f078c00cba7996253f1065e28296b54851c67590696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 10568 bytes
font_02_sfnt_off00013519.bin
5b5efbe9b15fa211c02f8961f550f10aa5e2166c8c856927f9abdd9dcd9b5ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 22440 bytes

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