Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3c92143dc8557d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 16:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23d77944391325ab6b1437285e7414de SHA-1: e7f60a89778c6b09c35f7cad5c67afbdfe703c3e SHA-256: df3c92143dc8557d230698e3553d056446ce74bbb361b67a24c4c885ee1b1fec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://fanaf.org/article_ressources/file/duzizikavulowizedasut.pdf In PDF document text
    • http://diskacme.dk/images/upload/file/74226569417.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zizekatezu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/67301726820.pdfIn PDF document text
    • http://4rrecycle.com/files/file/foxam.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/90837346108.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43678209932.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/3032175924.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210903_194653.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/tixagavotulawilagusodu.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/negunejilorazu.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/wovinuninarexewukobeda.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133293caaaab---fapobidefutuxowaga.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/17316895294.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/48532255178.pdfIn PDF document text
    • https://congchung7.com/upload/file/56342867496.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef5edced---balaxanimofipigixinadovos.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/lokumalato.pdfIn PDF document text
    • http://foodchemsino.com/d/files/43826616130.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/54241361830.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/50457540246.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/77764730835.pdfIn PDF document text
    • http://minhanh.com/files/xilukisogemupikira.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/20934355222.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vobotasozeb.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sopigegovipizatusoluda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=w+related+wordsPDF 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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16440 bytes
SHA-256: 6920517dd893af1e6ea20d0d81106816d5a6b6332fa8f6e5a34c8d4d57f9b43f
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10124 bytes
SHA-256: 0065a5cc80d3816ae441c6eb3dab3189eae28c9f2535ce67981c68be64432e2a