Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e855a357a125b7d…

MALICIOUS

PDF

86.8 KB Created: 2021-04-03 19:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 18987bc5c153099b32f5351d667471eb SHA-1: befdcaade21a9f532316590b042382c1454cbd79 SHA-256: 5e855a357a125b7df8c4fe36cce3eb38dd06bb56d6414bf1296798efd3db1df0
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://xesukifogenabe.iblogger.org/back_stretches_for_sciatica.pdf In PDF document text
    • http://ninefuva.22web.org/besividav.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/hjsZq6k/gufobigutetoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_5fff721017432.pdfIn PDF document text
    • http://dinejokudino.22web.org/2019_cadillac_xts_owner_s_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/Njfjjjc/teach_on_mars_poster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_6000c21fbc929.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/hDjcNnY/basic_derivatives_worksheet.pdfIn PDF document text
    • http://doxugivo.22web.org/bury_a_friend_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_606789fd21e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fffb9582b858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6001bf5720906.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/6c5VMia/business_english_audio_lessons_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=solar%20system%20word%20searchPDF link annotation
    • http://tepaduvofevog.rf.gd/dihybrid_cross_practice_with_answers.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_198e310dc42d4c1aa10f435405451755.pdf?index=trueIn PDF document text
    • http://terekeduwowe.rf.gd/ping_pong_bar_london_bridge.pdfIn PDF document text
    • http://padunogesabe.rf.gd/basic_english_grammar_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/gubewudewat.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/windows_7_ultimate_64_bit_torrent_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/71550464415.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_1a7a90be91f44d918993ebdfc10dc1a5.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1b4469f7cd8b4d7ea14f1af8e2daceb3.pdf?index=trueIn 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_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 5476 bytes
SHA-256: 3bc1736f73dc12d97c9b315b54f6aa63d02988ddaa0143fa7a82286ca00e204d
font_01_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 10696 bytes
SHA-256: 5897277715385bb08f6077d49d9eb1af7348e07e8cc142e10bba492925e78294

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