Malicious PDF — malware analysis report

Static analysis result for SHA-256 d655fb93f7f1613a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 16:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92c3fcad6abe80566421fcd4db291678 SHA-1: b627d83e964a571053a02ff96efbdff08ada2e5d SHA-256: d655fb93f7f1613adf99b93ca0bb36563c97d1fccf8c97996242a815c5c144a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, suggests a lure related to movie subtitles, which is a common tactic for phishing campaigns.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=the+conjuring+3+english+subtitles+download PDF link annotation
    • http://st-johnson.com/Uploadfiles/files/folaxoketefetijuletawipez.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lak1284fvqb79r0lip9q9tous5/46725844000.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/somarixadepagosumipoliga.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/85332706299.pdfIn PDF document text
    • http://ipllaser.in/uploads/roruvurasijumuliropefi.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/85136740690.pdfIn PDF document text
    • http://nincity.de/inline/file/18677278876.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vebudapaxapamoxevixixe.pdfIn PDF document text
    • https://unitjaya.com/contents/files/luzesipigabejusebadef.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/77103505159.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/60043165088.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/japenazonejunipusir.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/goxidak.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/xiguwodebedukajebe.pdfIn PDF document text
    • https://o-dance.com/upload/files/75413004964.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/34953799219.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jegipawafukazabowe.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/69346047496.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/38312611558.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/30341126736.pdfIn PDF document text
    • http://cocoal.com/uploads/file/raxuzoxifi.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/bedimireb.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/zarosiwux.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/43611242196.pdfIn PDF document text
    • 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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 11240 bytes
SHA-256: 0df24000a57387be0b9c0bbd089b0858b98fd5e72e77c48b38a8cc5e861f54a1
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 18944 bytes
SHA-256: c632efde8c100c85d160345f633c786e6713e23f02ea2b45a0eebcd0c4dac8c5