Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e81e3e7ebf76d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-10 09:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f996f63f16b02ea17eeef26111fef2a3 SHA-1: 3698af7b3eb0ebae7c438be8896ea20ed3f6206d SHA-256: ab7e81e3e7ebf76dedc3e13a944095328d7b2006908bf5a4ea9a4fcf09da8e54
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://mezovuduw.ru/123?utm_term=compound+personal+pronouns+exercises+with+answers PDF link annotation
    • http://idealica-italiaufficiale.website/99063863038eqr72.pdfIn PDF document text
    • http://epipog.com/mobogenie_pc_2018whtkv.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/Mggjdih/fajepidividilasefodosa.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/arras_del_espritu_santo_versculo.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/d0gchax/37480324833.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/ggRgcjc/97542983413.pdfIn PDF document text
    • http://8bitbeardsco.com/fringe_series_1dz36v.pdfIn PDF document text
    • http://medway24.com/bobotazuwt61w8.pdfIn PDF document text
    • http://boevoenlp.com/20552518057wq9bi.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/pazaftpfb9.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/Hhaecgi/business_understanding_strategic_thinking.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/55071081177.pdfIn PDF document text
    • http://ideal-it.fun/203689854618nftq.pdfIn PDF document text
    • http://potolkilife.ru/igmp_membership_query_vs_report5u0km.pdfIn PDF document text
    • http://beach-fruit.fun/participial_phrases_exercises_with_answerswdwiy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f280076-0f79-4a6b-8400-5ef1559c5c9b/enthalpy_change_of_neutralisation_definition_ocr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8904a76-18c2-4597-8ccf-6063eed957e1/98703348751.pdfIn PDF document text
    • http://semowomeso.onlinewebshop.net/what_is_object_oriented_programming_and_its_advantages.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5380 bytes
SHA-256: e95d150cfdd5745a688cc550375b35c1e3acb9bcda9a7b70726ba26da7947ca8
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 11132 bytes
SHA-256: 5aa97c668c36cebabe959e43dfb81e167d3db9c3ed013e7304025bc4f86e7fd1

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