Malicious PDF — malware analysis report

Static analysis result for SHA-256 c766f3f1038f7512…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 21:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55f43f3a519913eaa4fd08342f04b215 SHA-1: d68b5811e7575e9fc05457ee8ec70a6e446eb944 SHA-256: c766f3f1038f75126a64b18ea07d1b20b3c71470ff360650fce13ca2ea93129c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://stromzeleny.cz/file/ravagupetezak.pdf In PDF document text
    • http://imoroz.by/upload/file/tatuluzonozebojagizenak.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/91075960685.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/749aaded57865656b74bbbec86055066/5064629441.pdfIn PDF document text
    • http://yoron.net/up/files/jobikokamupom.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27672419360.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/javedevogijarudilozoka.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/topefupapapiwomup.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/welifokabejap.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/73954403776.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/xuriseza.pdfIn PDF document text
    • https://taperagi.com/contents/files/teginigob.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/4079513733.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/murotoguzujatazadu.pdfIn PDF document text
    • http://dges.in/userfiles/file/viluzezemeferukujoxavo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/litefujivatofe.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903154834.pdfIn PDF document text
    • http://195exim.com/datas/files/kotazozijefudopijedirezi.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/musiziwif.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/disunafila.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/95512401979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=viva+video+editor+no+watermark+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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 17864 bytes
SHA-256: 62a62192ae7c1208545573f8987b7be26137f01a3090de5f9799c21d6fbf60eb
font_01_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10552 bytes
SHA-256: b6e15cf5093aa699553d50d0b5ec7f862bca5e95fe7f8ee952b2a899c7c5ca30

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