Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea16b1d7549e8e0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 23:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5b5bc97122834fcc0e1b382fc84e212 SHA-1: 8057b77899a10e42c4aa936d1612d301b3a5f534 SHA-256: 0ea16b1d7549e8e008f543af3d1c2696e1cb9eaa3bb6f265e12e704137bedab4
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious intent by using a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=gta+san+andreas+apk+installer
    • https://coebmsf.com/userfiles/file/36314733766.pdf
    • http://www.39koratmachinery.com/file_upload/files/31879432707.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/24324896592.pdf
    • https://mobisteelegypt.net/userfiles/file/14438248784.pdf
    • http://parzenica-bialka.pl/userfiles/files/14687494665.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/37065148930.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/78784726661.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujavezufopopo.pdf
    • http://ramenhajimetustin.com/uploads/files/2242485872.pdf
    • http://chugguwang.com/files/fckeditor/file/sijasofevef.pdf
    • http://mya1fc.com/files/ckuploads/files/xedekinaze.pdf
    • http://tjjjsh.com/uploads/files/felijiwaguv.pdf
    • https://geniodelweb.com/file/84086431889.pdf
    • https://ms02bet.net/contents/files/18664659406.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6a5e27c0---66090334073.pdf
    • https://recapress.com/ckfinder/userfiles/files/12271038858.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65520e06d---3344960320.pdf
    • http://thietbiotoviet.com/Images_upload/files/54681829214.pdf
    • https://penzionradvanice.cz/res/file/kupib.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210913090454.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/17510250327.pdf
    • http://unitekinfostructures.com/userfiles/file/semuf.pdf
    • https://unosms.us/userfiles/file/34902119143.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_off0000d487.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 16792 bytes
font_01_sfnt_off0000ec9e.bin
2d4ab06cd23e7bd86f538c6446f855222992738d14ede3a917940be5c0735b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10396 bytes
font_02_sfnt_off00010438.bin
530c14917a77f7a4c5517ff271282569f963df2246ec5e45f3fb805129f5eb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 17552 bytes

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