Malicious PDF — malware analysis report

Static analysis result for SHA-256 648f4a0247cdf0a5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 03:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5a73695422696d33202dde4d74c3d8ad SHA-1: 5aea9baea0e13d56fcb61fa5a26c1d702faa53fd SHA-256: 648f4a0247cdf0a5603583bda218d068ab3663a96573afebcb924cee804b7e2a
116 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating a malformed exploit stream. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware delivery. The document body, though partially corrupted, suggests a lure related to accounting information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/123?utm_term=2+fundamental+qualities+of+accounting+information PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6035885b609b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477630/normal_5ff859bb39073.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/bedhead_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6036047b19d46.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/T6RoghP/kekemawopebogisadaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_602b514918cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_601f1cf359759.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/GZgggfJ/time_traveler_s_wife_sad_ending.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/rPV5Lib/fedofonu.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/aiaidLZ/juventus_fc_schedule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5fcc654a7c7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_602aa863b6c2b.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/603241b8-6987-492e-b396-68a8557ec500/agnus_dei_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc36f45d-08dd-4763-b7b5-d5fe1e4af4fa/63861997316.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/como_transferir_backup_whatsapp_iphone_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/confederate_army_uniforms_at_gettysburg.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/mugigujefu.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/6775552379.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/womekupetagunesawisisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3d30c8-4c10-4a56-8224-5f0352dca8bd/38076134811.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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 5504 bytes
SHA-256: b766630f6aa04349bffbb4942f2a620bd8e2cc98a74d718c8cc61f2659445bc3
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 10820 bytes
SHA-256: e81287f865379f3f3c8b0ee917d4df2742e393ddab7c0643de3ecbf3415c9dd5

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