Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf822e95bea1a5b2…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 03:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4484d1c29e1ed5621ce55a5a568835fb SHA-1: c68a573233a33a38f3f72d3592d0715064e3332b SHA-256: bf822e95bea1a5b277d61f03089c27aa9f207bd57c11e4f6094584e486e7e2b8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and a keyword search term, further supporting the link farm and SEO manipulation hypothesis.

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://leonvi.ru/award?keyword=pons+arabisch+deutsch+w%25C3%25B6rterbuch+pdf PDF link annotation
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/bddde4d2522.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/kuwozimefekux_fagoxabizaneva_bomojotixero_pitozeme.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/f918723d230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_6024a57d9a451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd308aee4a68.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/19215983182.pdfIn PDF document text
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/zizolosolew.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/molodun.pdfIn PDF document text
    • https://jezasozogederek.weebly.com/uploads/1/3/5/9/135960593/pusetinu_sirogexeg.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/bc75bb747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_60357277dba47.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/idgjhfD/jarilasazomalidun.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/eLtes7V/marketing_plan_and_related_resources_needed.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/rukiboruwefuwamifewajakil.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/basketball_history_and_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/CjhesE0/52073272744.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/8a79d2fa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/quimica_organica_john_mcmurry_download.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/velitubon.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/dr_browns_steriliser_cleaning.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 5580 bytes
SHA-256: f6fc9bb2866625b9cbc8cfe1f77eb6f42de7cbd81b9d8342fdb62f95077f1100
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 12700 bytes
SHA-256: deabe797ae9754ab44a65ca6701dc61730b229f82337eb7f80f54b49435c1958

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