Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb77b412a05cfd5b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-19 20:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2f41c90a94bec57c81371bfd879dfb9 SHA-1: 20d3f3898d887e8494782444069d133fb6859391 SHA-256: bb77b412a05cfd5bbeea39298da3c66bef1f1e9348e19a8aeed382f1bb628404
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=seven+spiritual+laws+of+success+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414696/normal_6010c997ac818.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/xYxjDib/juvenile_detention_officer_skills_resume.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/nepagorik_warez.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/bieRjdA/dynamons_world_2_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/cicYie1/shaolin_kung_fu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426060/normal_5fee02160649d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_601b00405e934.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/totamo_zuvenumofizo_dupejor_juzab.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/aee6cafde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_600ce101a8b74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_600485a220554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5fe382efed329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fd1cab81fda5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5fde4f76ca29a.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/hcjbicc/barber_appointment_book_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5ff1833861a24.pdfIn PDF document text
    • https://cdn.sqhk.co/badiboxa/dcgjgiJ/sky_force_fighter_combat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putojoner.rf.gd/donavijapilusomi.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/wodabukofaliwezaju.pdfIn PDF document text
    • http://zezajezo.epizy.com/glycolysis_worksheet.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://scripts.sil.org/OFLIn 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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 5608 bytes
SHA-256: ca1a9e64f41abdce9d0894a9429e441ecdca0029c0ca347d51a69abb6fe2a9bb
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10560 bytes
SHA-256: e1a5cc1ba72f8621658735f5a688ee092233975b143efade7c5ed084e376886a
font_02_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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