Malicious PDF — malware analysis report

Static analysis result for SHA-256 653420b8cc77dda2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 02:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90959f94e0e02edd18b99b4b8dbadb7c SHA-1: e0e7978c3d299dc625c1103f563544dc970f8cf4 SHA-256: 653420b8cc77dda2f1977cc3d914add10838165ae9f9e5e82dd9814327b7129d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to other PDF files on various domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

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://galluccifaibano.com/userfiles/file/dupewalo.pdf
    • http://devison-matras.com/upload/file/8925816150.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/litozebixadoxedunali.pdf
    • https://pjkconstruction.ca/images/file/ruxivumepabubug.pdf
    • http://eortak.com/img/fck_temp/file/rasevifejenuximakidi.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/32199863848.pdf
    • http://driver-jazda.pl/upload/file/vebiviwofadagepuga.pdf
    • http://prasongp.com/file_media/file_image/file/bemafibuji.pdf
    • http://meimagedance.tw/ufiles/files/41259446415.pdf
    • https://rotterdampools.com/contents/files/jixiduron.pdf
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/38278293184.pdf
    • http://studiomanzella.com/userfiles/files/23366346007.pdf
    • http://h-st.nl/bestanden/files/54877445329.pdf
    • http://manegedebuitenwijck.nl/uploads/file/mazatarelumedopazixu.pdf
    • http://www.ecostroyservis.ru/File/1357750525.pdf
    • https://nusantarabet4d2.com/contents/files/kitawilizufajefotenu.pdf
    • http://jplus-ag.com/upload/files/BodyFile__6142CA3CB26FC.pdf
    • http://efuturesthai.com/uploads/files/20889435438.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/rarupirorafo.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/25719534654.pdf
    • https://hkpefa.org/editor_upload/file/12621721555.pdf
    • http://maychebiengoduykhuong.com/media/ftp/file/mutopefafunozakosira.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/42629219337.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=s905x3+vs+rk3566
    • 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_off0000d558.bin
19f23f88f50a2485991f5d547afa6430a1bd9f2648806062f8aa789be8ffe19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 10444 bytes
font_01_sfnt_off0000ed1f.bin
c4e941ad73b5471f973612d23bdd5efae2fc51f27dfbb1abe59b85836362b446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 17484 bytes
font_02_sfnt_off00011a68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 16792 bytes

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