Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce97136ae21907d1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 12:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 435c55ca811b8c187ace14b57d835b68 SHA-1: 27a11062a9dc6474939ab72705904c4679f72839 SHA-256: ce97136ae21907d177ee81a7dfb4c2bf8f1c6a49b57bd8f04af09e1b40dac41a
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 PDF also acts as a link farm, redirecting to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rowadalbyt.com/userfiles/files/589312597.pdf In PDF document text
    • https://bak.vn/upload/files/kinasu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bawazatawebogubizaxo.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/guvolifijetesexedagijid.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210904_181048.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/wumimumepuf.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/42345489287.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gifosepowovokilet.pdfIn PDF document text
    • https://kermanrooz.com/img/files/20907537639.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/13377129954.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/87447364487.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/jazerimajobuvozepuk.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mujikozoxitulidixaxik.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/busobojura.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/68613207674.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/gosirotorodaxobukiz.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8beddd1a---71749630063.pdfIn PDF document text
    • https://media-get.com/userfiles/files/70195913327.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/8330168344.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xabesirajowoxeb.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/24176291827.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gukakukivitajuk.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/bodutofuvudulapat.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/xisizidogupalukobida.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kesatogumuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=365+days+english+subtitles+watch+onlinePDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 11364 bytes
SHA-256: a859553997a59d19aac31ddf79e817a52fb6e8006e66ac9fd5896fb6de24f825
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16384 bytes
SHA-256: 5787f0c27b1bc6ffd037fc0f00579c3fabdffc18c2deb53b1cbde0755bf9bb69
font_02_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1