Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa27ce10c2f871…

MALICIOUS

PDF

90.9 KB Created: 2021-03-19 04:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f5f250849505158d09a1d4f867e0a812 SHA-1: 5798dba7043abe8ebc17a6eb949011035fc37fcc SHA-256: 41aa27ce10c2f87196bebe761c36b0c6f05d9af657817cf5aecf84debf9a9d15
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 0.9988

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://seumenha.ru/award?keyword=arabic+baby+names+with+meaning+pdf PDF link annotation
    • http://piriketag.22web.org/vomefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fcd8c7b01c41.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/surupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_5fcf851b59d25.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/define_pedagogy.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/checkpoint_datasheet_4800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_6052c6947e9d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_6028a37d149df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/basic_linux_commands_tutorial_in_hindi.pdfIn PDF document text
    • https://f0d491a7-7d72-4eea-bbd3-72ad31f48a9a.filesusr.com/ugd/1acdab_1cd79a38a9254ee0814b418ad3ed2fb4.pdf?index=trueIn PDF document text
    • http://faxevimisosideg.myartsonline.com/80025015991.pdfIn PDF document text
    • http://sosibozipez.rf.gd/zegivesugus.pdfIn PDF document text
    • http://limekukojaso.epizy.com/army_command_policy_study_guide.pdfIn PDF document text
    • http://bizekeravafixe.rf.gd/how_to_design_security_system.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/caterpillar_colouring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/bilaminar_germ_disc.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_fd835a49833542e9bdf95d6569631b79.pdf?index=trueIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_be2253f9b1be4fa1bb2405670983b2a2.pdf?index=trueIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_f06c95f2d39147388be484e3765450ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxiweke/77771830739.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_022af4ad04854e22bfa098d0f97b3d29.pdf?index=trueIn PDF document text
    • http://melufisagaw.epizy.com/vedic_maths_practice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/campbell_scientific_cr1000.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/merulilejujiritomanizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 3984 bytes
SHA-256: c20ab4d79af473e65eb54aea04b40902fa2b74fb915f095988edff6ecaf66a85
font_01_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 5860 bytes
SHA-256: 518eddabf6e48b6075ebbcf335a3ed89b84f7c4c24e2a83f2419345932875efe
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 10800 bytes
SHA-256: 3c454d189ccf0f83ec69a0c99e8b35071150e9007fbce0c3af7f8ffda960ba05

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