Malicious PDF — malware analysis report

Static analysis result for SHA-256 db51457ce74e0920…

MALICIOUS

PDF

95.3 KB Created: 2021-05-19 03:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 12f28c8a1705dcf172048e8164dceadd SHA-1: 57c49db1f2a3469921b51252bbdf4fbe32232607 SHA-256: db51457ce74e0920c36807c5fa4a8522e5a06a8f4285f1f1f4ca8c0d22db3f96
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=how+to+read+percy+jackson+in+order PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381297/normal_603459c173d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60524f60b492f.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/8685168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcf232da0236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477156/normal_5fed94980b436.pdfIn PDF document text
    • http://rerolakareruxom.22web.org/continuous_improvement_tools_template.pdfIn PDF document text
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/6032623.pdfIn PDF document text
    • http://wisiripivi.22web.org/why_wont_my_keyboard_work_on_ps4.pdfIn PDF document text
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/gekomimanegukora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_60652a8edf44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_604184e21dac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6060fe7b17534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601027fdd14b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5feb07a5771a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fe6889e6bbfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60e9339d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_60307c30d15f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/kushiels_dart_plot_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/l5r_rpg_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/kitchenaid_food_chopper_vs_food_processor.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/41717199082.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/formule_urto_elastico_anelastico.pdfIn PDF document text
    • http://navebulaj.epizy.com/wetiwazeluxilejevunizel.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_off0001364c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364C 5332 bytes
SHA-256: fa335761b7e060ba7d8ec2c11f4e3dcdfeef7ad70c9e62128f309b92eeccc919
font_01_sfnt_off00014898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14898 11688 bytes
SHA-256: 52a50852272701df70389170e3d0c154c3d84c67d9943db7c8265cabe980a9c3

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