Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91deed5009e67a…

MALICIOUS

PDF

104.1 KB Created: 2021-03-20 22:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bd7d948850b56e501d800531486560bf SHA-1: 9d21f2626a4c6e619499b057db4f7608f79bd2a9 SHA-256: cb91deed5009e67a0e07ebba81e554477fbd088070891ad32fd505d9036a702e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a deceptive purpose. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack, likely initiated via spearphishing attachment.

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://crophysi.ru/123?utm_term=aristotelian+method+pdf PDF link annotation
    • http://coolvdomaion.online/33809475679q1goj.pdfIn PDF document text
    • http://whysmall.space/google_sheets_annual_budget16gpg.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/je3324e/brick_breaker_classic_game.pdfIn PDF document text
    • http://epipog.com/9147073958pupxy.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/IEOgdjf/autocad_3d_bend_pipe.pdfIn PDF document text
    • http://phtech.site/macbeth_act_2_scene_one_summaryfe7pb.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/suximawo/5929713899.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/why_america_isnt_the_greatest_country_anymore.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_1cdbd27c7c6548abb48b79b91d2902be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7871263a-2fda-4946-9506-561885b8a4d5/simplicity_regent_38_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/becoming_michelle_obama_summary.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_de31c336463045348bd4f0cb1f4af2b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/is_tiger_an_endangered_animal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef04f085-066e-475a-9c17-9ffa59a8136b/38831040439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0e75bd-8800-4dc1-8556-430ababc0645/99895139956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb68c85-a345-4632-bbf3-e04b49fcf92c/metal_gear_2_solid_snake_rom_nes.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_6b78fc0ba25e47b8b6226807f5c4f868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e19a8c-2c0e-4690-9eb6-4660ad933825/bulova_mens_precisionist_rose_gold_chronograph_watch_98b213.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/focusrite_scarlett_solo_studio_pack_2nd_gen.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/swagger_codegen_2._3._1.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/89607646799.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_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 16664 bytes
SHA-256: 78e1fb9ff8c38ea8a9dc349914ae6f049ca01e05fe303df30ddb6d930bc1344e
font_01_sfnt_off00015690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15690 5268 bytes
SHA-256: 17bd72e0ddcd3c6a7bf4bcd09c115471e81d814454bf368853197d8b6d2c06e2
font_02_sfnt_off0001684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684C 12296 bytes
SHA-256: 48fa2ad75a1dc3487acc2e13e1a35935da6027f1fbe81531dbe0b6716a7f3cfc

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