Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d3a704182c6539…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 16:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76d3fa96841cba08b7f38f3595063ff0 SHA-1: 11c5fd52bb41c1489043f822daef7fa8b1b7e6d0 SHA-256: 75d3a704182c653938b22e41fe00fb984063935d1c8d4046f54746e28522496f
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 0.9999

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://pelibifir.ru/123?utm_term=clarity+ppm+resource+management+user+guide PDF link annotation
    • http://pefiworawodud.mypressonline.com/14013483963.pdfIn PDF document text
    • http://organize.shop/xurowutozimybpd8.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/brAidKo/73913601072.pdfIn PDF document text
    • http://olymp-trade.top/what_are_some_of_the_different_types_of_sculpturesat03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600c3580a98a0.pdfIn PDF document text
    • http://spoonnumberone.xyz/divegizikumadixubeoa17i.pdfIn PDF document text
    • https://cdn.sqhk.co/timugulirebu/S2ghgdg/hard_logarithm_questions_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_602a27e2444ca.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/rotidunekefaxadarira.pdfIn PDF document text
    • http://onlinekartiadesi.com/78752893866cuhc5.pdfIn PDF document text
    • http://keysecret.ru/54144827821104a9.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/ijgejdV/solving_quadratics_practice_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_1cfade3b1f414f85bc861b08c4025bd0.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_6e6c9011920f460f911611d566f95356.pdf?index=trueIn PDF document text
    • http://gufopexolax.myartsonline.com/nature_and_scope_of_business_plan.pdfIn PDF document text
    • http://zijurape.atwebpages.com/cambridge_primary_science_stage_5_learner_s_book.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_437a9952134e4c12bbba4e091bbb0bda.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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 5400 bytes
SHA-256: 5ec8221ee3812796e2b463a76032225758d1a7bdf3e5901e6d187812e042d7ba
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10460 bytes
SHA-256: fcd7452e8916d0ed29bae9de96268ed869b1d37a140607faa3ef89dafa3c8a81

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