Malicious PDF — malware analysis report

Static analysis result for SHA-256 286be37c77bdbc42…

MALICIOUS

PDF

105.5 KB Created: 2021-09-12 20:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5487309cbc9097713760929776942107 SHA-1: f51c2fe6dad67a4b40eccfec85388f8ec78a8f16 SHA-256: 286be37c77bdbc425523b71a5a3b7f01cff70e077166ece54e499ac2dabc9ada
126 Risk Score

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 0.9961

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://ladna.pl/user_images/file/77247591676.pdf In PDF document text
    • https://quatden.vn/webroot/img/files/favewabax.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/80144937537.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xevotajumowukedojedo.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fenisixumakoxawejovov.pdfIn PDF document text
    • https://kimcert.com/E/file/nexepu.pdfIn PDF document text
    • http://xhzhengli.com/upload/35395702634.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fisizuteku.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/loxunasiverakowi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/38810925770.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/tirini.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ac55dhroimcpd1h5plnms1ieo6/nasat.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/51728322692.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/zozovogosadobi.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/xigujapabav.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/garuvil.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/88594000573.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/danejigosafemiwo.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/65613341993.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/laropaximuwulufizetiw.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63f7b7c04---33667646530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yu+gi+oh+forbidden+memories+para+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vizowubotejasela.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_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 11024 bytes
SHA-256: 22b0fa9abd2d4c75ea2ebd7103e775d5663adc329927701a708af244104ef298
font_01_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 19776 bytes
SHA-256: 0d58ea3b9f63f23ac1be3db4d5f0ef74b318ee5e8ff00deed7d5a57f6bfbb556
font_02_sfnt_off00017fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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