Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25fbcb10c0c96cc…

MALICIOUS

PDF

66.6 KB Created: 2021-04-13 19:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 88e6727c536b5e05f890f480537c9cbe SHA-1: 56e42394db67282019476ce1ac2a371633f6af3c SHA-256: e25fbcb10c0c96cc30fb469fcca7cf4a50118d29eb32975f6c74014de64d6d7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent URL pointing to 'jacksth.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a potentially malicious site, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=tin+tin+buffet+charlotte+nc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6012fb4c5c5da.pdfIn PDF document text
    • https://tedibijufu.weebly.com/uploads/1/3/4/6/134678634/pepuzazadaner.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/sorinoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5ff3fcdf8d616.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/caDicqX/furreal_friends_starlily_my_magical_unicorn_pet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_601b6df04cfe7.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/kghcalL/vofudag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_5fe7cfda12be7.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/2QgjUif/55850161562.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/ngc9ujh/g_switch_3_two_player_games_at_poki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_af53b5e302eb42b690e4583215055888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/nazimor.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/4939047155.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_do_i_delay_part_b_medicare.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/callan_method_stage_1_portugues.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_588fe4e7a1b94422bc91886cef4f1153.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/carry_on_luggage_rules_american_airlines.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/40599473166.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/android_mobile_below_3000_4g.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/tinkle_double_digest.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/xebugigofe.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_da29ec159c984fefb2b0127b0104c52f.pdf?index=trueIn 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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 4880 bytes
SHA-256: 688a518b6e8b69626f6222a5c8d3019cbf2d203b80cb5e0eb616d3d8f2bee11f
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 10332 bytes
SHA-256: 1b888b6c9e50a448832eca32e18321756caeb1a65ebdcf0ebf743144895d51f7

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