Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec804d8d467bf7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a47b81685c8e8e6ce541b06cdf4aa12a SHA-1: bd5192a9fa304bf485adfa8905afb0a97ca95c18 SHA-256: 8aec804d8d467bf7e734fc9c43341d462662e0c13b8d780bd9fc00aec4591356
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs pointing to external sites, with one specifically identified as a link farm on disposable hosting. While no scripts were directly extracted, the presence of external links suggests a potential for downloading further payloads or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=vip+box+ufc PDF link annotation
    • https://reparationmobile.net/userfiles/file/tewugagepuxewupove.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/87894665467.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/senuramasa.pdfIn PDF document text
    • http://standardamulet.com/files/files/98913176382.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/27736001196.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mafusekeb.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021090408271441026.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mupomibijituz.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dagapibiwezakupo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h8p66eo0rb3cjii8f8qg7e0dtr/7609343194.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/44121763960.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/wopefovanunalafewoxub.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/jabodujegoxaselodep.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lurolesufenedopur.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xivisegubisuzubugupide.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/73992130508.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/37675717337.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412aae8cb24---61152829942.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95130595380.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jugasusip.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/nimatejakikekudurifagoge.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/kixekilax.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/81724592701.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://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_off0000af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 9972 bytes
SHA-256: cf29e881caff0c420b006e3fddd89aba07aa824c813c0c6c510203706bbf3e3c
font_02_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 18332 bytes
SHA-256: 4cb76cada4fddf87ff200e6f08e7ae4951803a81913e4f0604aa57c105a0eeba

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