Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04c54a8d6e812b5…

MALICIOUS

PDF

84.1 KB Created: 2021-03-14 13:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b093e80667949461e5bc7068c88eb43 SHA-1: 2b5094ca7e081c18ea17d930630f0679bfc5750e SHA-256: d04c54a8d6e812b53a6728f19999b34f660b7c3fc718dc84c557f00fb7e2c6a3
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/wix?keyword=waiting+for+superman+worksheet
    • https://static.s123-cdn-static.com/uploads/4482018/normal_5fe3134f8e840.pdf
    • http://fejugutafilevin.scienceontheweb.net/what_is_the_paperclip_test_for_power_supply.pdf
    • http://napodosawukezob.getenjoyment.net/favove.pdf
    • http://nafewid.sportsontheweb.net/kadaxem.pdf
    • http://tokiridevifo.medianewsonline.com/91748979919.pdf
    • https://cdn-cms.f-static.net/uploads/4490375/normal_602ef1e908d4e.pdf
    • http://feremujidonigu.getenjoyment.net/free_exxonmobil_aptitude_test_past_questions.pdf
    • http://rawoxaxevog.mygamesonline.org/89941308774.pdf
    • https://cdn-cms.f-static.net/uploads/4415073/normal_60332de400f78.pdf
    • http://ruregere.sportsontheweb.net/selumotidejodusa.pdf
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fe1106979584.pdf
    • https://cdn-cms.f-static.net/uploads/4410414/normal_603c0a28e0087.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivala/best_platform_bed_frame_memory_foam_mattress.pdf
    • http://positajugopisu.myartsonline.com/52875984065.pdf
    • https://s3.amazonaws.com/ximupuv/best_acoustic_cover_songs.pdf
    • http://nosawakudik.myartsonline.com/rational_and_irrational_numbers_worksheet_grade_9.pdf
    • https://s3.amazonaws.com/pegozegi/poxolirafo.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/raxawenadapu.pdf
    • http://gajutar.onlinewebshop.net/personal_swot_analysis_example.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_off00010a50.bin
c756a410581cb141eafc88e59d3ed456d23049aea085ca7f1e989074ece2324e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 5452 bytes
font_01_sfnt_off00011cd8.bin
daffd0cada6ca691c7abb6f6f1378ff602089452ab7b5e2bf2c96c148d5a05de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 10856 bytes

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