Malicious PDF — malware analysis report

Static analysis result for SHA-256 256a8d414fd910f4…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 18:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1435c5dfbe2e52400b4ec4e65026ed43 SHA-1: afcb695b4357d3485a54d56077f2be94639eb8bc SHA-256: 256a8d414fd910f4d83a2b9d320fd468f7cda985872c712f1e7ac48d0ca2291f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing other malware. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=powerful+intercessory+prayer+requests PDF link annotation
    • https://furetexagorude.weebly.com/uploads/1/3/5/9/135958868/sufobu.pdfIn PDF document text
    • http://formulamoney.top/lavender_blue_dilly_dilly_piano_sheet_freejb6ib.pdfIn PDF document text
    • http://probmaka.tech/report_writing_on_road_accident_in_bangladesh5ff01.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/g2jfL3e/the_lawless_clone_wars_review.pdfIn PDF document text
    • http://xoratepexewona.iblogger.org/grand_plaza_hotel_corporation_annual_report.pdfIn PDF document text
    • http://arbitestpark.xyz/gta_cheat_codes_app_for_android2ezqs.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/epjhMig/33789020214.pdfIn PDF document text
    • http://webmastervlad.ru/transformation_physique_definition_chimieds7qv.pdfIn PDF document text
    • http://kellys.space/pozamumupfeuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kabisebax/injustice_gods_among_us_apk_mod_obb.pdfIn PDF document text
    • http://musarozopod.rf.gd/caddis_northern_guide_waders.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/xevika.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/alone_movie_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/43160752122.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/29381983149.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/xojikixuxebuduledizibexil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 5212 bytes
SHA-256: f2ba45d3f64229546217ddeeffffd310db1717051ece2f01d4b63f58138f4ef3
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10772 bytes
SHA-256: d97f91a25216441a8d3c954d6911066eb9dea47a0d18e1baaa98d5a63920efa1
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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