Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f827e3fff11ba0…

MALICIOUS

PDF

83.2 KB Created: 2021-03-08 01:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a458f8d0c40c9be33f6249f43b9fa22e SHA-1: 297a23ad561dc7fed53a6470e596fe077b4b47e7 SHA-256: 56f827e3fff11ba0f2930b30a8e5124ff7c6f1054479f7b00d9760028fdd89e9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'mezovuduw.ru' which is associated with a product search term, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=remington+electric+chainsaw+16+inch PDF link annotation
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/fbd7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_60105a5ccbb46.pdfIn PDF document text
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/dofubomul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5fc8c098899e2.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/sixuvenakareraf.pdfIn PDF document text
    • http://faruvob.iblogger.org/esl_relative_clauses_exercises_worksheets.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/administracion_de_medicamentos_via_subcutanea_definicion.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/jinus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_60036b5f4da51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_603b09254bc24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ffe437174140.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/wavunot/cooktop_4_bocas_brastemp_ative_bdt62_manual.pdfIn PDF document text
    • http://pamixawikisif.epizy.com/tikigar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8b557d-a1b9-4c85-9171-84c5434c3d5f/98174933376.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/wagner_915_power_steamer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/pastilla_reveladora_de_placa_dentobacteriana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07df4443-8cc4-469a-89e9-8a2b3a250d80/wi_state_constitution.pdfIn PDF document text
    • http://dagalukuxi.rf.gd/46846747214.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/1000uf_capacitor_datasheet.pdfIn PDF document text
    • http://roparewuna.rf.gd/endless_legend_guide_jojo.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/juvotelexusasonaxajotawa.pdfIn PDF document text
    • http://biledimetiwen.epizy.com/ohio_guidestone_lorain_county.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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 5516 bytes
SHA-256: 9ace9a61d9a60349c335071981bb8ad64f757b17eacb6e2b030ee03c54f3e5b5
font_01_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 11040 bytes
SHA-256: feb1299120b4724d784065fcf00d8b60c30cb4fb5b2c8590cd5a0aefc621d150