Malicious PDF — malware analysis report

Static analysis result for SHA-256 4681194ca87b6a92…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 12:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50fcf5acc92273d63f2df28b847fd8de SHA-1: 701cb8cb3a6837c12fae1cdf11b8d5bcafe9e73d SHA-256: 4681194ca87b6a9292a2eaebb84985e1e5e927971812a572b391f87bc4a1874b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection for 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The ML classifier also flagged this PDF with high confidence. The numerous links and embedded script suggest the document is part of a phishing campaign or a distribution mechanism for further malware.

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 http://trust-law-firm.com/userfiles/file/20210903061359_239897055.pdf In PDF document text
    • http://cardealer-space.com/js/upload/files/92787488555.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/wasuzega.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/xejesukekefineketazolemil.pdfIn PDF document text
    • https://htchninc.com/d/files/lonijavinosopesojawefa.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/velesa.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kugovoluf.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/72684941551.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/matozotafitigi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/nifik.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e558546414---56516057507.pdfIn PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/xidijubenufepola.pdfIn PDF document text
    • https://datajournonepal.org/files/tididusinisekojaker.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xomidajukoxum.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/16100395658.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • https://photofetimages.com/bewawevisidupejefule.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sabiseduker.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/76463803029.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/78797645051.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/11128460257.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/xenolomijusuje.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/texezogok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=one+piece+psp+isoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 9988 bytes
SHA-256: 24bdf0f3d1388404223779e8cbaa930ecb2b95477b99738155a3998ab18fa4ca
font_01_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17616 bytes
SHA-256: 6e2dd36fcea111e23c2128e3d7cb493edcfa3f789deaf53cc52a7f2977047014
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1