Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b0ab63c073d378…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4eab6cbc57757b7f60a5b78b6cefff2 SHA-1: e751ae26ac36f5599fb5fdcb96531f1ff5780add SHA-256: e1b0ab63c073d378ac6b58ca9880f0a9f3ddff6d4a5de0fd1a7a3b3bc32a5cca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also includes numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.bash.cl/media/file/gifuwuro.pdf In PDF document text
    • http://licausi.it/userfiles/files/zuboruwobufusi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8bf95aa639ccf98b24cbcdf5a04d1746/15803739395.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/92128533549.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/53305674458.pdfIn PDF document text
    • http://lagrupacio.cat/file/51881064173.pdfIn PDF document text
    • http://agro-partner.com/Image/files/54512659068.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/21946486883.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/98375009730.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/movelavidelorofalugejam.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/pozimajururefudeme.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lovakafodelar.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kivujuromitukumulakid.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/39386482882.pdfIn PDF document text
    • http://195exim.com/datas/files/kabokimejosumu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/repufedoga.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nodara.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/lomexol.pdfIn PDF document text
    • https://fratellifurloni.it/file/7302743720.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394b8360448---88784290242.pdfIn PDF document text
    • https://themalc.org/files/file/jesegusemesavovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=all+my+life+vfPDF 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_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 9784 bytes
SHA-256: 1ad5869205206fa74be6c02a8bba847411077f6601ab587cda9a356b2563393c
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 19160 bytes
SHA-256: 5e4c28ee3d774615424b3c0f55441f85962454fb5c953d03835b9b94b741aedc

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