Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da7a32b26ab7033…

MALICIOUS

PDF

71.5 KB Created: 2021-09-14 06:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7acce49b56744122be340263dedae28 SHA-1: 9ce49b27d10b961f2c9a055522affa26c186b488 SHA-256: 9da7a32b26ab7033338116c71581c940130bf8c7a11641f3653dc3f9092362f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a strong likelihood of this PDF being used to redirect users to phishing sites or download further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909175504270218.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/gipekeluwepaderarek.pdf
    • http://gazomotor.com/allinone/file/vilusulu.pdf
    • http://www.toptehnik.si/images/74477151361.pdf
    • http://tensoinox.com/userfiles/files/92598045677.pdf
    • http://np-laser.com/upload_fck/file/2021-9-7/20210907230231855775.pdf
    • https://hotelindigha.com/FCKeditor/file/pixobabamonixi.pdf
    • http://omni-links.com/images/blog/file/63602985487.pdf
    • http://risme.vn/files/87730585099.pdf
    • http://ohdiabo.net/images/ckeditor/files/87167896313.pdf
    • http://wonikqnc.com/upload/editor/file/1630501810.pdf
    • http://cocoon-source-harmonie.fr/public/file/xonij.pdf
    • https://implant-drill.com/userfiles/file/rovakesanujivivom.pdf
    • http://jeanchapleau.com/userfiles/file/dobubafuniwiwoguniko.pdf
    • http://movietek.vn/hinh-anh/files/vejekefenavifobuxa.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nanumul.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085ab6b07---wobamaminage.pdf
    • https://corpusbg.com/files/fck/file/15649205883.pdf
    • https://thehouseproduction.net/file/93725244317.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c2b0376f4---95579784988.pdf
    • https://linlinline.biz/js/ckfinder/userfiles/files/varevefezimu.pdf
    • http://saluteebenesseresas.it/userfiles/files/paveguvenatifuvasurejas.pdf
    • http://trubaopt.ru/content/file/xoletelejozeredevano.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/jabukuwuwamazenuwopojeja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inshot+transitions+apk
    • 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_off0000b180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 16792 bytes
font_01_sfnt_off0000c992.bin
5ce4dcda0413fe85ce304f87d62c58254027138543689510087e518d8d4f5636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 18012 bytes
font_02_sfnt_off0000f84a.bin
4f19b6c4547f99290e6fe9b2a733be69859145604d868dd0140e955ae3a15a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 10212 bytes

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