Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e587114c792591…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 15:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 974e16716f382f14e1f53fffd018c28b SHA-1: fabc9648fde345abde9335ca112a8ae944a26d70 SHA-256: b4e587114c7925915348a43eab7c1beb0c719345d71ac8be584a670451fefeec
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to a book summary, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs is a key indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=los+trabajos+de+persiles+y+sigismunda+summary PDF link annotation
    • http://sowakowakemim.mygamesonline.org/6th_grade_math_word_problems_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/jfopBjb/canvas_student_for_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/Zs60hiH/marketing_plan_sample_business_plan.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/are_necchi_sewing_machines_still_made.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/gfHiiii/android_device_care_storage.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/lightroom_shortcuts_pc.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/42816048005.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/jazamerijekufol/game_one_piece_grand_battle_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/mudatiwujufe.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/possessive_pronouns_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/bending_ply_sheets.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/avast_premier_antivirus_2016_final_free.pdfIn PDF document text
    • http://safinunel.epizy.com/ramakrishna_math_courses_2020_in_hyderabad.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/71399381013.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/game_boxing_star_mod_apk.pdfIn PDF document text
    • http://nolumer.rf.gd/paxulozazer.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/kegaro.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/tone_it_up_workouts.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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5536 bytes
SHA-256: b6c0662df91f9895e8615fe39c47d16788db9dd0e65cc884c44a614445aa13b2
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 11520 bytes
SHA-256: af5a9d554bda2720a096df8990b41c57cbf0658c74421a7c79c9b33e880aac67

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