Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e23f87a1c3e18b…

MALICIOUS

PDF

78.6 KB Created: 2021-02-26 14:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c734f9bb88fc51813f11f15bed30c4a1 SHA-1: cac707537905a025c4a403eab052cb5ee3dd6cb8 SHA-256: a2e23f87a1c3e18bad2bcf2c48de2e6542afcd264daa61e5a41f7a2ea9e16e4f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO poisoning or distributing malicious content. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing or trojan variant. The presence of external URIs and the link farm heuristic confirm the intent to redirect users to potentially harmful content.

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://midufefew.ru/123?utm_term=apocryphal+books+of+the+bible+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369766/normal_600cb3cb2f39a.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/fVdhfig/dwayne_johnson_wife_name.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/eJigjaL/nedutev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_60325a7796cd6.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/the_7_laws_of_spiritual_success.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/SnQunja/sazuz.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/tukata.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/b7aicWE/zonujugexebeborakuze.pdfIn PDF document text
    • http://xonigej.mypressonline.com/65263785425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fdcbcb9c48d7.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/advertising_and_integrated_brand_promotion_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/gd0hgHX/snowflake_stock_symbol_robinhood.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/honeywell_smart_thermostat_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/free_access_database_templates_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/why_is_my_brother_printer_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/possessive_singular_nouns_ending_in_s_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/dadekozejuveta.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/makeup_business_plan_template.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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5540 bytes
SHA-256: 27b144d6f786e8cadd37b5027ad733589ebf4d7841b6c04f1d83c14617ab322d
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10740 bytes
SHA-256: 534ff06773e2ae6585a0a5d3b2a8e3d5c23b60ca9b0ad32d7ee3c4cc15770b5c

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