Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a6daece8ab1b7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c64073f10b47900768e9a1a8f5c501a SHA-1: cbc525dc4d5fa7601017d1f2cb8cf3947ba01a5f SHA-256: 951a6daece8ab1b74e31054c72c0c04e4ff360b0166218aaf6bb97a7ca335b28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs found in the document, which is characteristic of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://petrovsky14.ru/docs/files/56564875297.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/mupekuvezasilo.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/33692949436.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/77351455439.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/27026878009.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/89304534898.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bf1d9fe967e259bd476a49ef1bf20c16/33261115826.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/68403514677.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/10280513878.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/64782135528.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/biwapigo.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/83391244754.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773a25e790---61027504212.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gobubekezeti.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/pedix.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901142003695053.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/23769728332.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/52824446433.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/volarapuzevol.pdfIn PDF document text
    • http://dezis.ru/uploads/files/dipozalukebim.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/18471741664.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/larofifulagajofaxa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///89146989462.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/26730747580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=structure+of+leaf+for+class+4PDF 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 17980 bytes
SHA-256: c89a4fb32f096760af6183d747e24000f2151a7ed0a66a77a0509ff99a32407a
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 10388 bytes
SHA-256: abe2dc0fa0fa910c8d4df6d698baec6e72f4e3cef365a9ce452c7b5835d69012

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