Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ce3cb92156869…

MALICIOUS

PDF

88.9 KB Created: 2021-03-29 01:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d87c5373335bbf593fea4d55600a6ba7 SHA-1: 22980406fa7b806ab07b760129fd235d2a8cfc3e SHA-256: a55ce3cb921568696b95400747903085ece1a1b15439d0ab259e57ae788a0e24
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's designed to redirect users to potentially malicious content or phishing sites. The presence of external URI indicators and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=bacteriologia+general+pdf PDF link annotation
    • http://rifaxot.22web.org/anxiety_disorder_books.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/navevelutibobodakugobip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_603a234ff0a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fdc7f81d6c0b.pdfIn PDF document text
    • http://lalevuw.mypressonline.com/jovuwokijowumobe.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/ge9geJL/depawad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_6046634202b7f.pdfIn PDF document text
    • http://laxeded.iblogger.org/rasowukudepalamunomawepeb.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/angels_robbie_williams_sheet_music.pdfIn PDF document text
    • http://gigewaxupupixe.22web.org/25923092641.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/heidelberg_catechism_question_112.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/wimone.pdfIn PDF document text
    • http://kigurumi.org/husqvarna_240e_carb_adjustment5nppx.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/Ypgdjhs/national_test_abhyas_login_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/Zgdhh5e/skin_orange_for_minecraft_java.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/Eigjgjh/adverbs_of_time_worksheet_for_grade_9.pdfIn PDF document text
    • http://hot-money.fun/tuguwafativ5fqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_604fc433a2806.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ehiUjeQ/43153810427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0b39a8-51d4-4b54-8119-1da8b1e487ea/mixajilekopuvegedoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d31601-3d77-4245-8358-ce69d51ac879/tadadukunadez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6986438-a1ba-4af0-8462-8434c24764ff/error_code_67_unable_to_establish_wireless_data_connection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d60fd23-fca3-47c4-8cae-121bbffc63ea/does_the_whale_die_in_free_willy.pdfIn PDF document text
    • http://jawikiluzejibe.epizy.com/37593154615.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_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 5196 bytes
SHA-256: e2a6fcabcc436b88f981dc2250a423f1bf15bdfcabdbed7b1fc99c2e23a702de
font_01_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 14384 bytes
SHA-256: 3b44043b9a71c5bda426aaaa07023eae0f6369ad379f0741f75ca65990379e2a