Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b246efa121a0b4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc6df1477652fe0f0e02a6d254b5fe4 SHA-1: c9fa48eb8de11515cdac26fbaf33f59659fe0ba7 SHA-256: d1b246efa121a0b4aa004cc9e0702384754b7c1b6ad3739989229a2a53677c57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=watch+harry+potter+and+the+philosopher%27s+stone+full+movie+online+free PDF link annotation
    • http://gartenstadt-apotheke.com/userfiles/file/19417055642.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nilekunodarivowu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/61710041352.pdfIn PDF document text
    • https://dafelia.com/files/zufakuxipobelirukimejar.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/2338589834.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/91490886020.pdfIn PDF document text
    • http://boki.hu/editor_up/nedunijizis.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/88004173346.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/87291103380.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/ranapiboralin.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/34876143033.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokusow.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5a0e824f---jojofubipopafaroxupufowo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/wozusoxoputar.pdfIn PDF document text
    • https://x-software.cz/data/file/52279468298.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/49061238370.pdfIn PDF document text
    • http://ruihuitax.com/files/file/92400485.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/71347558572.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cecb382e4a82ccc0442dea3c37497165/22773566976.pdfIn PDF document text
    • http://tradotel-riviera.com/file/14030367963.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wisuxodenodusi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/63289001682.pdfIn PDF document text
    • 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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 11192 bytes
SHA-256: ed5c5c98d04490a827106e3abbc61071feed057f00073a8e3ee16d1bf2000d48
font_01_sfnt_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 17288 bytes
SHA-256: bdab31201ecd7dd81e590b93e4fac911638f7d291b5bb986796704af9af8ada1
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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