Malicious PDF — malware analysis report

Static analysis result for SHA-256 345254480a678c22…

MALICIOUS

PDF

75.8 KB Created: 2021-04-20 13:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 596dd8b1ce82efb88107b5778a48dda9 SHA-1: 75d0682b740d4682b65777e1c850bb04570b9094 SHA-256: 345254480a678c220477578d516da558c27f53022158fd6f14476a57453ede0d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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 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://mezovuduw.ru/strik?utm_term=what+are+the+4+basic+elements+of+statistics PDF link annotation
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/434779.pdfIn PDF document text
    • http://winoraama.website/black_and_decker_edger_bladesa61k1.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/selurunamefunigike.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/nujifoga.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/wu_tang_show_on_netflix.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://adr-media.work/bowling_xmas_party_londonmnc0f.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/wabaligefujiwame.pdfIn PDF document text
    • https://gufobetatogeset.weebly.com/uploads/1/3/1/0/131069923/6588b4f6bb2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzulozak.atwebpages.com/99672740305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0c23d4-2fe6-4b60-b439-bc8467fff7e2/1st_grade_math_multiplication_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/barkatullah_university_online_application_form.pdfIn PDF document text
    • http://zibevili.onlinewebshop.net/muscle_building_diet.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/desabejevefulawuwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1755cba4-6541-4c06-bd0d-54b480dfd75a/17245510710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50576bb3-892a-42fc-a171-8cb924956b83/99380205806.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/mueller_report_book_club.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/venimiror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae876bb-a85f-4c9b-934d-967329f18a27/xotutawubuma.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5364 bytes
SHA-256: 5dd3f1266b4427f832bb0355eab54193ea189f1163b7826f9c75852c2736cc02
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 11236 bytes
SHA-256: b49a8f2936094656fc703755285ed42f9d8968a5a74470500095fdab55a2bfab

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