Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845a5ab7de09800…

MALICIOUS

PDF

82.8 KB Created: 2021-03-30 20:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8e021571bfd1c4effa0e46845d46c14d SHA-1: a5dca32b4f22069dbc3854e8d0a594325079619b SHA-256: a845a5ab7de098005518e63480750714cc627f38f823a0d2650f6a82374d5f4f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('botokaw.ru') and another to a link farm ('zoredufuno.weebly.com'), suggesting it's designed to redirect users to potentially harmful sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=layunin+ng+akademikong+pagsulat+pdf PDF link annotation
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/7975803.pdfIn PDF document text
    • https://jowizixevudaw.weebly.com/uploads/1/3/4/4/134489406/mulelowovap.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/zujaxumaju.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/fufagepifitakurosorajevek.pdfIn PDF document text
    • http://mamuxorap.getenjoyment.net/zavoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fd280246205c.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/fbb991ad.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/how_to_write_an_essay_in_apa_format_for_college.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/6307dec31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_601c6479ca195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d68967d33c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/86248234876.pdfIn PDF document text
    • http://wadedizori.epizy.com/71345594476.pdfIn PDF document text
    • http://wekolutunumoze.rf.gd/axolotl_cuento_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/jijowezedurakexopel.pdfIn PDF document text
    • http://lufaxosakovo.rf.gd/pdf_acrobat_9_pro_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/xoworedarusowibe.pdfIn PDF document text
    • http://zexukojol.rf.gd/foodborne_illness_worksheet_answers.pdfIn PDF document text
    • http://dinijeti.rf.gd/splenic_infarction_treatment.pdfIn PDF document text
    • http://sojisij.epizy.com/26025455454.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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 5372 bytes
SHA-256: 9eb8ac47a7f7fcbb15b133b905b938b7469eb1f1fc605ec45f418873f9c009d7
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 10932 bytes
SHA-256: 384e565054574a285df3122913f1e7758443d1f5aa3b4a90f73780a0614d4fc2

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