Malicious PDF — malware analysis report

Static analysis result for SHA-256 d851c4097efc544e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 22:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 581d9cb9c58c8482ded8ae9f38dedc71 SHA-1: 3e95434c29655792bc2d35f59c1f162e5859999a SHA-256: d851c4097efc544ef25a7f568d0dd6a420a2e52b8d8038507ec3505f437b1cd2
174 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external websites, some of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to deliver a second-stage payload. The embedded JavaScript is a primary mechanism for executing malicious code, and the numerous URLs suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://irinabailey.com/upload/files/zekow.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/44159645603.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/2767797463.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/34903867798.pdfIn PDF document text
    • http://showdoimovel.com/files/files/kuxojupen.pdfIn PDF document text
    • https://redac.ch/upload/32117397749.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e73572bc9---63939418283.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/74807442341.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/27555457339.pdfIn PDF document text
    • https://empresa-venta.hr/files/biwopodudafetifuma.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/porufupazinuxorevapebux.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/15348950674.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/14274627309.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/varuromemirejagawojuxun.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusujupegokijodiforiso.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/82833574750.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/xibiri.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/mizudijetojubuwivi.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/jefafapinux.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/30369421191.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/93571579904.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gosavakexeju.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090514192473499.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/nobuwulewejiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lite+mode+chromePDF 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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 10112 bytes
SHA-256: 07d72a6f69495f65cf9971ac9ea0f29707e22b25001dc25e930d73da744dcec4
font_01_sfnt_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 15616 bytes
SHA-256: 56dd9a83752cacc1372c3bcd27d666297dc1299336f9a8ab56033e9dfd2c8d39
font_02_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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