Malicious PDF — malware analysis report

Static analysis result for SHA-256 508c9650e2549dea…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 20:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e44fa4041dd05342d5bbcd64349be263 SHA-1: e77a8fb73741111ab3aaeb9f49beb225cb98aaa0 SHA-256: 508c9650e2549dea4465ad28c598111a2b191151ce00c15e29bbdcf4b7b824d3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://showpalmedical.com/userfiles/gefeloxemutawazefewiw.pdf In PDF document text
    • https://argumentua.com/i/file/63152772033.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/nifilotelugebonosavaduxi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e267fe16d2---peseviselabi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/bejuzenene.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9069671058.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/34938589833.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/totipigajusadodijev.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/dubudilazexuserulovesep.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/putifudag.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/93444413565.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/danudonivebo.pdfIn PDF document text
    • http://grimastone.ru/files/7066370182.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/bumula.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/luwur.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/3428565326.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613237010eb93---nutikigepajivesegowora.pdfIn PDF document text
    • http://airzo.net/userData/board/file/40017795140.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/rifirofame.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawomimenekoj.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/67559120566.pdfIn PDF document text
    • http://industrialdevices.in/uploads/94050019472.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/79532875389.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mupovosekikifatofosok.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/duxutexijuzotasenoborixib.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/jerenisisutoliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=1984+movie+torrentPDF 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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16996 bytes
SHA-256: de4401b7088481a5b5f549a08f74171dacc1ea1bc6589591d330d78f0ba842ad
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10368 bytes
SHA-256: 57ac4518bd009480d8e78985ed1d4e785e9a9ba8cdb0ef01988c424b2ecb251e