Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2d3ee216a8ed75…

MALICIOUS

PDF

90.1 KB Created: 2021-02-09 16:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b8cec77ca19f3ec0eba6075ba4732a4 SHA-1: e5c54bb9d47a74f0b178cc99035ca127281346cb SHA-256: bd2d3ee216a8ed759a5574fdbd030fe1a162f462aec5331a07fa24eeb50cc34f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wb?keyword=beehive%20class%209%20pdf%20packing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462974/normal_600e5abd93ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fd11e7de6e3f.pdfIn PDF document text
    • http://sokfresh.fun/xetonirosigelosez5lhka.pdfIn PDF document text
    • http://feyakast.online/ethical_hacking_meaning47aak.pdfIn PDF document text
    • http://stopnutristrike.ru/dub_community_of_russian0ij3.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/baxigasajuviw.pdfIn PDF document text
    • http://on24-system.club/missing_411_map_oregony2z9m.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/nujotudusijoxis_zaxujewijekare.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/wudoluma_witikenudoka_kagatorebedivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_5ff65c80511f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fee1e00ebc6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fcc2bb0b18c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/33442145721.pdfIn PDF document text
    • http://wozawexopad.epizy.com/canon_t60_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/likefusevenurizirovixujix.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/hm_inspectorate_of_probation_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/67915912738.pdfIn PDF document text
    • http://wepirizifomonij.epizy.com/bc_forest_fire_report_line.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/ffa_history_timeline_worksheet.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_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 5652 bytes
SHA-256: 8134dd18ff1e85e9d651641f7cca7fa0b0efcb3d3bf9f2e7e4f357d9c25c4c52
font_01_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 10868 bytes
SHA-256: 416461d414591bf861e36d95b3c7db3126f96e27552b49f2526b7c4e9ca9dac7

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