Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a911422be13158…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 14:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 413e531016a17e74a177d655b895dd56 SHA-1: e06ac265be122a2edd238dd65a1ff0614fbb0053 SHA-256: d7a911422be131586cda05f4cb9d330469c1822db37ff9e287bc764f4444ef21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to numerous distinct hosts, suggesting an attempt to obscure the ultimate destination or distribute malicious content across multiple sites. The PDF's structure and the presence of numerous links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://tayles.com/uploaded/56753962389.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/durufomixupoxepa.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nisuden.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/xubekimu.pdfIn PDF document text
    • https://kimcert.net/E/file/buduruxalu.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/bifapuk.pdfIn PDF document text
    • https://soechi.net/userfiles/file/niwokuza.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/merajonaxetovikiwudozepi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/95356952374.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109201559354737.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/26673226960.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/pinunulebalumafeta.pdfIn PDF document text
    • https://cardolf.ro/files/21243986097.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/26657114559.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wajodamesukopazuburebitos.pdfIn PDF document text
    • https://photojet.net/userfiles/file/kefedasifapigogegalev.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/saxojerugope.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/niborusejapido.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/87920268503.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090512311234.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tokizutuwexasofomutakut.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/98c92d1c042a5adc3030b678ebd13074/33533125961.pdfIn PDF document text
    • http://cobmedia.hu/include/lediz.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/69292003738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=synchronization+services+app+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17012 bytes
SHA-256: 708dde97b61217316fc001a417c2f4f7420811f5261f23741b31bf865b298739
font_02_sfnt_off000135ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 10984 bytes
SHA-256: e5e86188e6ec60f0358350960ffe46e16695939c0a48bdf8d75c2a814504a68a

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