Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ed42b4e92f306f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 21:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6165ced0dcd2ed0514cc8dd6bfdc285 SHA-1: 2574491a1223a452c1444c70953f86775d972c65 SHA-256: 26ed42b4e92f306f9ed8809e5853d4abee25e59acbe9f2918da501e880bbb3ee
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, with one specifically identified as a brand-impersonation credential phishing lure for Apple. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous links suggest it's part of a link farm designed to host phishing content or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://ketchas.ru/uplcv?utm_term=fortnite+rare+accounts+for+free.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=fortnite+rare+accounts+for+free PDF link annotation
    • http://smart-ventures.ch/upload/Editor_Images/files/tajikogesofixavelikamere.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/lomenigama.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tajunejerojojirozupenosi.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/jifowekixiliza.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/9591707897.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161360a0159349---dibatesaxadalepu.pdfIn PDF document text
    • http://julianina.dk/upload/file/40179192696.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/6692916259.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/tokatuvevuwopabakomor.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/66076982704.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/kasurodif.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/vepebazidosabinurul.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/58278729282.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905061209248.pdfIn PDF document text
    • http://nanopena.cz/upload/file/dokone.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/lajufisulajibokamowoxipe.pdfIn PDF document text
    • http://lovesenergy.nl/file/11534406242.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/73347379590.pdfIn PDF document text
    • http://halmar.info/userfiles/file/6424883408.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/79929015544.pdfIn PDF document text
    • http://ternovykh.ru/content/file/66499289715.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xerudi.pdfIn PDF document text
    • http://co-mit.com/uploads/files/logiwuladagajomixupolu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/6605101050.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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10360 bytes
SHA-256: 1ba72a28b273c5ca79a4ccdc96ebf23d01e2a70c4cb1707cddbdb27e8ba07f8d
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 19268 bytes
SHA-256: 02a462df9517215d7904362e45d7a15051df6cad3346705727f8f5ae73ebebe4

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