Malicious PDF — malware analysis report

Static analysis result for SHA-256 2720da468813df1b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 04:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ecbad52c97851e1f6de3d1ca2cadfd6f SHA-1: c0ab467489016423219ae6091cdb0531ac913184 SHA-256: 2720da468813df1b177b3e9ff8686042810312e613bccc41f731d93fd570b10d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on various domains, suggesting a link farm or SEO spamming tactic. One prominent URL, 'https://jacksth.ru/award?keyword=comment+fusionner+deux+fichier+pdf', is presented as a search result for a common query, indicating a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=comment+fusionner+deux+fichier+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456671/normal_60281ac1e5f72.pdfIn PDF document text
    • http://wopurijosepi.iblogger.org/agenda_meeting_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5ff2e54fcb423.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/8dc4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fe197095b05e.pdfIn PDF document text
    • https://sipemesiga.weebly.com/uploads/1/3/4/0/134095973/3395110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_602a53892447c.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/6631309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_605ee26dda307.pdfIn PDF document text
    • http://nuseterowit.iblogger.org/64790239488.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/notetu.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/rijiwe_nugomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e341c9-5ba3-47c6-9a33-6445c3ab71c7/gejigusezijud.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/remington_electric_chainsaw_sprocket_gear.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/gowedirebizasamofewavat.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/lubisi.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/kakezuduruxubu.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/the_trial_and_death_of_socrates_sparknotes_euthyphro.pdfIn PDF document text
    • http://keputeka.epizy.com/bypass_google_account_s7_android_7._0.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/zuvokogeseja.pdfIn PDF document text
    • http://zodufidexafuge.epizy.com/alimentos_con_alto_contenido_de_calcio.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/carcassonne_board_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/audio_format_converter_portable.pdfIn PDF document text
    • http://fijedenojex.rf.gd/apresentao_empresa_construo_civil.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/bremsweg_bei_50_km_h_faustformel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4badd1c5-fbd7-4a53-9967-3cfe98b2b4ff/40674387610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916f4fad-45c7-46fb-9814-901c69a77cae/64894777593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/966d8531-f389-4b9f-b678-ef7bf4e0d343/30130478643.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/best_stockbrokers_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f346bdfe-523f-4974-b7b0-46690d061748/96677538753.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 5128 bytes
SHA-256: 6316bab1f35bd0abd108fc083f2bb3510e2b2f9af44d3524807de29283c1fdc8
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11968 bytes
SHA-256: 8c15d8f55785875991b7f46d498bc0733b9a6909b5a6f7d0c06c51cf1f8e9b25