Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b86d6c856720f1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-14 04:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b300af2ec19f37a605c9977c5c9f862b SHA-1: 5f706f6b135160756b38b69fd00714edb09d285b SHA-256: b3b86d6c856720f10761644941c79cf50856697d2a74bc33d6061d089f736d18
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://vilenefex.ru/award?keyword=html+color+codes+pdf+file+download PDF link annotation
    • https://cdn.sqhk.co/xenivoronizu/lieriiV/vipezawakijurudenovud.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/cover_letter_template_apple_pagese4uwh.pdfIn PDF document text
    • http://naturfresh.fun/85218124560mq7r5.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/chhhjjg/aankhon_ki_gustakhiyan_female_singer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_601e2e741b3ae.pdfIn PDF document text
    • http://rrrrkkkkk.space/sql_interview_questions_for_testers_with_answersrk52i.pdfIn PDF document text
    • http://itali-big.space/volkswagen_service_center_navi_mumbai5oqfg.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/517950042820y8ni.pdfIn PDF document text
    • http://ogranicbio.fun/lebezoxedipuxilijgg9z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_6000dc17f0ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_604af467a1d24.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/2ifXxih/cat_running_away_from_home.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/robumuduluwise/wujoxibafezagoxuvodurufo.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_cfff4dd9ff8340b296fd8cb073906e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/new_action_movies_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/independent_contractor_invoice_template.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_838b12cde3504705b83bafb8e4aa4017.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_881c6950aa174194b91eb598ab7c8101.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_1a9af0d68df44519bbb97dca24104053.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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 5356 bytes
SHA-256: a10dc01e305d4e5354e83cc10c21a59fbbd7631e9498047242b27d1a80197ae8
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 11852 bytes
SHA-256: ebfc9a7f0918f466982d28333c14a6cf6cc40c2f6c81412ac9645817621eb2a0

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