Malicious PDF — malware analysis report

Static analysis result for SHA-256 5406fc580178e59a…

MALICIOUS

PDF

82.7 KB Created: 2021-04-11 02:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3169d469562a0b6f3d2b416764a066f1 SHA-1: 59bc599efb378620a875ef930233cf8a8531a477 SHA-256: 5406fc580178e59a44b6ae564fc1d889e46f8bbb513e243fd6bbe57d010edf40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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/strik?utm_term=how+to+change+the+textures+in+minecraft PDF link annotation
    • http://luwinilulurop.mywebcommunity.org/philips_respironics_bipap_auto_sv_advanced-system_one_with_humidifier.pdfIn PDF document text
    • http://verifedform.com/woguripirokovunajowilegy5ioj.pdfIn PDF document text
    • http://dom-bita.org/xotamupozoxuwipivateds9fx.pdfIn PDF document text
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/6625353.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/27c1628.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/Qciehfn/las_vegas_tournament_of_kings_review.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/9474185910.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/solijov.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/geidjdh/redbubble_masks_safe.pdfIn PDF document text
    • http://spoonnumberone.xyz/10664600546adbie.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/what_is_long_run_cost_analysis.pdfIn PDF document text
    • http://photoforce.ru/bagaliwawinasiltv76e.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/autocad_3d_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_2e76775de2574ab19110e707762be2d9.pdf?index=trueIn PDF document text
    • http://dolojivek.onlinewebshop.net/71123284219.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/doduwu.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_26c6ed9255844e449adea1e422cd3866.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_e55c5ce5df6948648ea920ec6ad98ac1.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_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 5384 bytes
SHA-256: c2d9a68ad82c18510138ec31e4c7a85d17cf054e16aabc84d4bf1dc598aa5111
font_01_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 10688 bytes
SHA-256: 25bfae01885229fabfea639bfb97c54bc6ea880cddfef7fee8a22c329e86e96e

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