Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae387e756e35f787…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0134f0488119981bd0e33eda39fc27ce SHA-1: 4670ace4c76b3d6d24d3e352ab27c7974b3c2317 SHA-256: ae387e756e35f787e40075a66940375ab7c34ed09fc5c249e0eb6430182bf46e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to serve further malware. The presence of embedded JavaScript points to exploitation of PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=guess+how+much+i+love+you+free+pdf
    • http://innospectrum.eu/hirlevel/file/57296988221.pdf
    • https://allmassage.net/upload/file/20210910203054.pdf
    • https://accu-split.com/userfiles/files/vuwemupow.pdf
    • http://farmina.ru/uploads/files/dabexoronokog.pdf
    • https://sofahatinh.com/upload/files/gumawotuxakuje.pdf
    • http://logopeda-empatia.pl/content/file/30294071959.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/44842813717.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/safogeroso.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/juleket.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/25773722475.pdf
    • http://linuxnewyork.com/draft/media/80992743747.pdf
    • https://sma-dfgg.org/site/admin/file/608390678.pdf
    • https://fix2go.info/userfiles/file/31243401491.pdf
    • https://menu2uplus.com/images/file/vubojadaket.pdf
    • https://panificioilcavaliere.it/userfiles/files/96478928562.pdf
    • http://cmuniontravel.com/userfiles/files/91711706493.pdf
    • http://autosoftware.company/autoresponders_images/files/52322517215.pdf
    • https://longhoang.vn/upload/files/lupexu.pdf
    • https://tonmathunglan.vn/upload/files/likixijozivi.pdf
    • http://krakow4you.pl/krakow/files/gimugope.pdf
    • http://z-sinpro.com/upload/files/71039527951.pdf
    • http://bkm-market.net/userfiles/file/98496906687.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_off0000b1cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 16792 bytes
font_01_sfnt_off0000c9e4.bin
d7a2f0ce48392743a278b1263a48b2f50f50efafbd11ce7f3b83f82cff65bfe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 10924 bytes
font_02_sfnt_off0000e33f.bin
611097e4db50b1aedd5e91721b4a66bdef9ba31b719f114a3d0eca4e158953a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 17204 bytes

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