Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f381ea08065b7b4…

MALICIOUS

PDF

77.8 KB Created: 2021-04-11 08:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: be9ab1cfc00c2732be7ec04760efc914 SHA-1: 99350e75f6054bf14afe808f1dac7900020a7d7a SHA-256: 6f381ea08065b7b4ef76bb2b8582064df394fc01bf3458587186dc66b53bbaad
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 0.9997

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://druttle.ru/strik?utm_term=best+model+helicopter+for+beginners PDF link annotation
    • http://leqqurint.online/does_straight_talk_have_free_hotspot980rw.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/lejokonuzesugawuwan8llpp.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/21812364361.pdfIn PDF document text
    • http://euroshopmn.space/278268536114bbt9.pdfIn PDF document text
    • http://reduslimitalia.site/34802184463w8evl.pdfIn PDF document text
    • http://waliduv.mypressonline.com/96_yamaha_kodiak_400_carb_adjustment.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/fafadekuxixeka.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/chapter_9_access_control_lists.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/dbms_stats.gather_schema_stats_list_stale_example.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/lukegusuk.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/classic_kitchenaid_mixer_cover_pattern.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/tozarej.pdfIn PDF document text
    • http://alifan.store/198667008601rg7y.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/genetically_modified_organisms_social_and_ethical_issues.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/audit_report_and_opinion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_a0909ecc19b6479481feeff305d1f73f.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_7e003308c31747bfb996a2060c6d2e79.pdf?index=trueIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/life_application_study_bible_apk_full_download.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_c278bfde76d54e5f9b277df3b5d05ffb.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_513958d5d8d647ad8f3dc916baef4119.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5548 bytes
SHA-256: 18d882bac6b569d8f0e3124729776f59aac281a9af24f7df14195953df891fa9
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 10672 bytes
SHA-256: 9d37c444b474d8f9b60f3fbf440e109ebdc6ea05f953fe4069d5658eed695021

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