Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef05b674efcfd0b6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 06:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc71afeb8a48f21b6b7b0a744cdcb6d6 SHA-1: d9cb6c48e21f452d335b558a0c12da9e18bad74d SHA-256: ef05b674efcfd0b6aee30ed9a95bba66423f53fccfa956e6f8827792e362986f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs, which is a common tactic for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://officialbacknumber.com/editor_up/tobodo.pdf In PDF document text
    • http://123podkrovie.sk/editor_uploads/files/98781422867.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fedumape.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lijenawaselonokujedado.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/12563423740.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/96350213580.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///83298588263.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/tobizivasib.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/72512231011.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/41162910331.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/20855712595.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/lamapojidilevomakatufepof.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_100435.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/bevalowubagivaxujuma.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/42875326833.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/kafudomarurulolaw.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/rapub.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/xinubovokakosenemunejoni.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/81042559361.pdfIn PDF document text
    • http://muszempilla.com/files/file/61008742633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tamil+2020+movies+download+tamilPDF 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_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 10664 bytes
SHA-256: fb570432983d13ce42264b3c4ed3ea26027d05b24c0f211223463220625b996e
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 17352 bytes
SHA-256: c4b135884c5acabcebfa2e598c1de9b6997b6c761b45252ef5f24611b1bd8d09

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