Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1f30ed62641a0…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 08:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5d1c4a9a9033d869e0e8a8c4a21c17fd SHA-1: 795564e714f8ee245d1e787bcb9653941e0c7ef9 SHA-256: 3ff1f30ed62641a0be78405e2b4d17ff326f951b71fb970b8e17a0c4cbaecc33
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users, likely to a phishing site or to download further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=apa+essay+format+example+pdf PDF link annotation
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/eb453.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/xajazu.pdfIn PDF document text
    • http://gifazat.iblogger.org/sustainable_built_environment.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/fizadox.pdfIn PDF document text
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/nosenilixositun-maxukiwemev-gepolodafir-belalikuma.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/2960ce1c7cb2c.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/do_air_purifiers_have_washable_filters.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/physics_class_12_punjab_textbook_board.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/5994869176.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/gasomisulafabojuriv.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/zugiridokijimugasujelif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofenilar.epizy.com/groove_essentials_2.0_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/73869391672.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/the_existentialist_s_survival_guide.pdfIn PDF document text
    • http://xilijimerufosat.rf.gd/49507164792.pdfIn PDF document text
    • http://godidab.epizy.com/aambala_movie_hd_video.pdfIn PDF document text
    • http://piserujirabubam.epizy.com/pride_and_prejudice_summary_chapter_2.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5348 bytes
SHA-256: 387f015550530a42b856ce8fad119741137800610820fa52c199fbc30fa310e4
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10160 bytes
SHA-256: 9ac8416cd940171789c64e3af6110c602b4753e97b34d3e50bb07f86a6b9414d

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