Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2601e979e8ea30…

MALICIOUS

PDF

79.5 KB Created: 2021-03-09 04:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db121b8248472145772f2a2c8e62793c SHA-1: 9bae67e25979575c8d5f83d40f707810319efc9f SHA-256: bb2601e979e8ea30ee58e637c5baa0136b484e1e6daa1e313f7b89f8e3de87cf
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/123?utm_term=google+chrome+setup+exe PDF link annotation
    • http://zespodsvetkoy.site/church_of_england_marriage_application_form1fwk6.pdfIn PDF document text
    • http://kvrovk.xyz/razozunitugerjc67a.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/ieuAheN/jumamigep.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/dRiejjM/bitejiluripuzufev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5ffdc294af96e.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/39372250078.pdfIn PDF document text
    • http://torchland.xyz/935011182397u86f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387571/normal_5ff105fb6374e.pdfIn PDF document text
    • http://roflan.site/cute_wolf_boy_skins_for_minecraft37wod.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/4gcT9o2/download_animal_stack_3d_mod.pdfIn PDF document text
    • http://lavka-karamel.ru/15045844432m0fzi.pdfIn PDF document text
    • http://rubyshup.space/modern_mathematics_form_4_exercise_with_answer2k2ic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_4dd02d45aa1d4981a43537efba6f3aaf.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_b891b4f71e15400a9f4d3141a89feb66.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/nesaresizulozidegufepe.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_980383294d9b4f86854a59e77bb456fe.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_2fc0f1e638d44b3688304582315f8c3d.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_dd1401e964ee40319fb407a63c70957d.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 5236 bytes
SHA-256: 2f513f391fac3d31a1903df1256effd69759356de6dda6852a31dd85d9dd3db6
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10684 bytes
SHA-256: bb01182d7aef8babe560389e2a73dd3e0ddfd322b08bd5712770cb2b27178dba

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