Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51c15c4b0cf7863…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 19:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82e66b5797098437ef86e31fec1ace55 SHA-1: fa1021975761abbf586c687d55214163625f2c53 SHA-256: a51c15c4b0cf7863f26e0be3696b800b8cb5d2432906bb87db6dd6c15c9ad9dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of 'utm_term' parameters in some URLs indicates tracking or campaign-specific redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=what+happens+if+i+wipe+data+factory+reset PDF link annotation
    • https://patc.fr/imagesfile/99959620818.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/85816545821.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/17869196723.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/12440804211.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/xapejilekuvufubexedogi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/63671771227.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091405454348.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/lotibugu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/19186049830.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/13328598673.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nhr2st3v7pe3hfldnkt3edsfom/popabomizewevuxopuperugi.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/femizixipepaxa.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/pufimegamerapomelebe.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/digunigoliposamesukekena.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/42701019465.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/27257731887.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/53155322069.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/fewugozitemufomelefovap.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_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 17216 bytes
SHA-256: 5d932a4bb0af5cc059a1beb44f0d5efc0e98a794b8c51b963a4515c0586d072d
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 10864 bytes
SHA-256: e7adb356d5774b7880bf044b0f079bf86f31c1b7c30572f5285f7d60f4fcc131

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