Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a0cfd589b3f06f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 22:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70e25b8de33f431c4d0b745f8f093c44 SHA-1: 2e87436e0ef43cc1afa5d673159040719eeb9d69 SHA-256: f1a0cfd589b3f06f5b7512d421d88f505bc86ed481cb8047555e3edaa3d0a03c
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/123?utm_term=acha+chalta+hu+song+ming
    • http://makebugobiwuka.mypressonline.com/swot_analysis_marketing.pdf
    • http://kigofumitinezig.iblogger.org/kazutomubafunenidefiw.pdf
    • https://cdn.sqhk.co/sivadapexiri/jfghjeO/74753344891.pdf
    • http://pozuvixa.getenjoyment.net/bafafebalazi.pdf
    • https://cdn.sqhk.co/niririga/bgeVG9U/82294894833.pdf
    • https://cdn.sqhk.co/woxekivepi/P0jdnJS/pokemon_type_chart_gen_4.pdf
    • https://cdn.sqhk.co/disumuneriva/ggX8Iig/2020_formula_31_pc.pdf
    • http://wofijolusiga.iblogger.org/vikopuxilifegexil.pdf
    • http://kexolifowuj.medianewsonline.com/why_did_i_get_a_red_spot_in_my_eye.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jupolirikajetu.rf.gd/hp_5510_printer_cartridge.pdf
    • https://s3.amazonaws.com/zugutixe/transformers_age_of_extinction_decepticons_names.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_ed3cdcc2f746486682ff941db1529c7b.pdf?index=true
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_85e82553b06b4d65bc55904119eaa47a.pdf?index=true
    • https://s3.amazonaws.com/tuxalowafokuvo/bajuxinagiwinojiz.pdf
    • http://xatonidolib.epizy.com/accounting_terms_to_know.pdf
    • http://muvekalufisu.atwebpages.com/2018_amc_10a_solutions.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_46b19924d65541779b07ac24b115c452.pdf?index=true
    • http://voxotili.epizy.com/what_is_the_meaning_of_husna_in_arabic.pdf
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_c42ad26eed714c139908a12957ca2cf9.pdf?index=true
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_2665cdcee33c41588a4e2cfe1c1b272c.pdf?index=true
    • https://s3.amazonaws.com/zedudo/multi_step_inequalities_word_problems_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/wupixufekijax/epidemiologi_bronkiektasis.pdf
    • https://s3.amazonaws.com/gavobawum/vaxepajiwugikutazi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec19.bin
2fb6c34f40ab7852e8e5bf285aa852eca726c06a53a42d60aafc114d78224fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5104 bytes
font_01_sfnt_off0000fd53.bin
56b9d02083514b8b1a7d2e511dd10cf2fd352407e87747b08a932eff67721986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 11144 bytes

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