Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b880700071727e1…

MALICIOUS

PDF

97.4 KB Created: 2021-09-18 01:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e46fbf3866e7909c06dd3c4f6f71da1a SHA-1: 792353d8359c394de8297bce1666ef2fc04234a1 SHA-256: 0b880700071727e19dd1f923e134ecb495c776d96a33e3665830a62f1d452702
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=how+to+measure+decibels+android PDF link annotation
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84035170200.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/modape.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/24661361210.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/wasajabamoxumumadopiko.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a6d461ed---99655671673.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/faralixilima.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/gemizikoruvotab.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/67925796583.pdfIn PDF document text
    • https://mkart.it/uploads/file/92901921021.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/44201356200.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/80398834595.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/47320174495.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/54694812544.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/bareveguwowef.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/duganogafo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1a49d274dbd91f30d8eba2de7b11daf6/97691099057.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vapopevaromimulinoj.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wazufuwufiladem.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/98924491304.pdfIn PDF document text
    • http://katachizu.com/img/news/files/75645042696.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/32781976194.pdfIn PDF document text
    • http://ledins.lv/cms/file/4461255586.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/fogegekipimonavakujimi.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/jivokalawowatamevapen.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_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 19140 bytes
SHA-256: f5d2026c75a231eb17b7552131fe73007bb2287b3f91d41909ec149a09fe06cf
font_01_sfnt_off00014686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14686 10848 bytes
SHA-256: ff42a98c4e8ce0e7aada07f9a6c5fee6c94e5b36c9df6732a05469680368ff5f
font_02_sfnt_off00015f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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