Malicious PDF — malware analysis report

Static analysis result for SHA-256 d734903dee2846bb…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15f56b3c5f128809a4bdded76fb1cbb SHA-1: adae686bb68c3ff6eca375c6e4c39e010cf22362 SHA-256: d734903dee2846bbbe8f167121691020c6ab3d712dc5867196ec7c61d15bc60d
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also includes numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites, possibly for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://ketchas.ru/uplcv?utm_term=android+studio+emulator+pubg
    • https://alakharia.com/public_html/userfiles/file/83661026307.pdf
    • https://riolospettacoli.it/filesUploads/file/toraforako.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52356766417.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/61220430998.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/46099803310.pdf
    • http://ebd.su/UFD/7623/files/woxelinibabizofine.pdf
    • https://cevhertemizlik.com/userfiles/files/ratoteminirel.pdf
    • http://full814.com/upload/files/tewosenifinoxisonigen.pdf
    • https://accuratesearch.com/userfiles/file/22702182939.pdf
    • https://rajatotogroup3.com/contents/files/lexanusone.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/41645551605.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-03-06-55-01-31.pdf
    • http://hanmih.com/userfiles/file/20210902101510.pdf
    • http://mrpokedb.com/uploads/files/vopewarotejokuvi.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/27051518771.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/44114414026.pdf
    • http://thermogroup.ru/uploads/files/vogasatemisegetolutisibi.pdf
    • http://gianenricofabro.com/userfiles/files/fiweda.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c34c79577a---zujokupi.pdf
    • https://jkmart.net/FCKFiles/File/17314682785.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef697b2eb1---45258270759.pdf
    • https://presstone.hu/userfiles/file/39194431793.pdf
    • https://escolaalfa.com/userfiles/file/10269597303.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_off0000f233.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
font_01_sfnt_off00010a4a.bin
0d2fdc3d4f59c30646cdfe1bc2d427c7391a50d0cc2652ad4035da9242aeed79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10956 bytes
font_02_sfnt_off00012344.bin
625830822df4e1cfa3286be1985dc531e9f77aa86920e17c152bcb095ac2288a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 17680 bytes

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