Malicious PDF — malware analysis report

Static analysis result for SHA-256 3540b92700b23e7f…

MALICIOUS

PDF

67.9 KB Created: 2021-02-21 22:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 359ef25b7c93e224dc36af1371b550f2 SHA-1: 234ee2a68e972bc83cfe8a5d3fab790c183e9146 SHA-256: 3540b92700b23e7f8010bc2d723ae37b6a1a188762b707d26d605ac71a4c5ba7
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and has been flagged by a ML classifier and ClamAV as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'En espanol 1 textbook answers'. The presence of multiple external URIs, including one pointing to 'jacksth.ru', strongly suggests the document is designed to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=en+espanol+1+textbook+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fec7fe3ba19c.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/ggqJgiQ/final_heroes_best_team_comp.pdfIn PDF document text
    • http://kemytbok.xyz/lavijegafovebutazz3324.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/i7fieZM/65776677254.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/lnhhhde/lujegizadawurawasababiri.pdfIn PDF document text
    • http://copyright-notice-ig.com/20198513750986p4.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/himhaPo/nupetufemixij.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/ihbigij/nebagelefik.pdfIn PDF document text
    • https://cdn.sqhk.co/pudinivil/diehclX/anonymous_stickers_wastickerapps._com.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fefbff7b44f7.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/qg9gdif/xalilagijebipek.pdfIn PDF document text
    • http://shopee24.site/779321549284io4d.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/hjgdFiX/niwutogeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/2dcHhcL/minecraft_earth_map_server.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/fheerlY/marktplaats_bv_contact.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450249/normal_5ff87e8d0d7d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ff026d3d26ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/11PvgcB/hidden_veggie_meatball_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/g3hbvf8/gumowakogelaxat.pdfIn PDF document text
    • http://vsspb.ru/vajapabor9dzht.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
    • 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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 4924 bytes
SHA-256: 67d5e51fe6bdf4d5d78df6795e222215b77ece1a064c19447e7625eadb1bf66b
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 10268 bytes
SHA-256: 4246cf9fb4b2c837a707ef7eec3dcdae69fde5def670c50707098df9944dd905
font_02_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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