Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0725a0f48ed5d5e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3df59e928635df1ecbac126d57454855 SHA-1: 6531a4255fb9c09328d8490f952f11b0f27b9e61 SHA-256: c0725a0f48ed5d5e97a78c9d990befbe32ca85a2b12c4ce17c4f26416fb92fc3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by directing users to potentially harmful websites. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://truhlarstvisollner.cz/data/file/90083239325.pdf In PDF document text
    • http://proallprint.com/userfiles/files/33211920001.pdfIn PDF document text
    • http://slsnn.ru/content/files/vuzebosuxotarebukan.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/dokubazamelewovatamegeke.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/sugorejamebojivip.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/mufev.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/zanedopotozogokulinom.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/52675195227.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/10989142812.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/48228620039.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/59670575656.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/rubopibiwilafiboruxu.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/gijawixosabenozegolefelur.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/29153911970.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/47312784778.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/29250259755.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/dabexegafuziv.pdfIn PDF document text
    • http://efrex.cz/files/file/fewugupalojorolope.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/98538575522.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/58196987491.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/jivulak.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161402136103f0---wisudevudir.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/japofulubakelododasi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f8oni6jdaic8tmuu3tj185fij1/dewugotoxibolepuv.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/nugejifojowanosifagiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ad+free+video+player+apkPDF 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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 19196 bytes
SHA-256: 46254e06712f6e3c3a4129c7f9d130ab4abfbb534a4c9186c5e8440d598c66bc
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10372 bytes
SHA-256: a1aec7b3a35de47e90af61a9b7c3ead00a08b7c75954f17e1d0412171f81e724
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1