Malicious PDF — malware analysis report

Static analysis result for SHA-256 3412b5222d077a54…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 18:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 433fb440d86e333bb9dfeb9ab2a90dde SHA-1: bd3d9f76cfac473aebc898db4db1c576399bc2d8 SHA-256: 3412b5222d077a54db557bcec3bd813b359d3d911601072ee6cd474385268dd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is identified as a link farm. The presence of these links suggests an attempt to redirect users to malicious websites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://izeninfo.net/admin/upload/files/nanekawodekeki.pdf In PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fafizogedelisoninalum.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/48913190339.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/nogikekovejawesixo.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/zibavumevasanuz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tawupepenagixepajarumanar.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/6903548283.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/viboruxizodofiruf.pdfIn PDF document text
    • http://jar-ted.pl/file/lakaraxodusuwul.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bewuvodozo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zoganokoxuzuzom.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/gurisosalonatuvaxi.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/zajanunugitagiforoba.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/bozujunedegajukuzoxalo.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/90712371073.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/14325096179.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/46797885772.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/93243285119.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/069202ce2f93826a691aad942f0c8356/59103150490.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/36494367686.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161371a3654491---98951760690.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/gurogasezomolapozomidajik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dragon+battle+mod+apk+unlimited+coins+and+gemsPDF 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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 18300 bytes
SHA-256: 52109f53961690b7024c26725d247c18c4cb91391ed305cc4c82a1fc3af59ca6
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 11192 bytes
SHA-256: a817c4f6b7f634b9faf43e756d8dde3c755a0745b4cbe3dec3a56b6df4b59a6d