Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04fddab4f1604e5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 14:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bec2678e9b3cc951f8f96881b98b10d8 SHA-1: fc6e20be9e9e138cb46891a01247c94c5d6afc7c SHA-256: c04fddab4f1604e578f983c1ad317c84e82a94c25c93245ba7185c9d7934fff5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with exploitation attempts, likely leveraging a client-side vulnerability to execute code, potentially JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i1pm3ai7s72imspc0tmnkk4fj6/67402054659.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/sivitelirafumi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/35303860508.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/pudolesitafos.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/7318656382.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gepukazafa.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/41567010287.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/30883448676.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/latoz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370ab8c1d7e---28818405468.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/93173813324.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sotuzuz.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/15480102271.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910101139.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/pasubas.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xipuvenofin.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/70486941089.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/natedosunadimunewavozow.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/tezor.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/zatabotixezuresu.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/muzolafolejijexipewufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mirror+tablet+on+pcPDF link annotation
    • https://lapdonline.org/file/jekupanolexar.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_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 10332 bytes
SHA-256: 8224c75737ed5b134e031fce8c0c598a6ce0b3bd7defad1ed898b4d765167bc7
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16576 bytes
SHA-256: 7855595e86d271d0174e63efac44659033636cef7f773c9153dc5bcaad263f56

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