Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1da0111f95f81c9…

MALICIOUS

PDF

72.2 KB Created: 2021-02-15 12:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a174713b113b8cd40e4e6d2386fbbaf SHA-1: 14d5af77eb027d5e833707cd53ef25bc93e0d35f SHA-256: d1da0111f95f81c99d3ab772bd06d29486cae30c13c874efa8d02f4a4de324a1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://seumenha.ru/123?utm_term=irony+in+romeo+and+juliet+act+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464863/normal_5fd2567665d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5ff0281b631cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_600ffa6a5785c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5ffe46da50036.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/free_templates_responsive_sites.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/bodotufaforuvibaraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_601c76777ad49.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/9663213.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/2863080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_601175dec59ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff7641a44416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_60165a0a628da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_6006983d7c8a2.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/581db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujoponax.epizy.com/angularjs_interview_questions_and_answers_github.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/52744884839.pdfIn PDF document text
    • http://devepovamijube.epizy.com/coloured_rice_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/abrsm_grade_8_cello_s.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/xubibilebaxolekopafe.pdfIn PDF document text
    • http://puwagof.rf.gd/guzasegexeguz.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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5108 bytes
SHA-256: 64aa87cdd15b166f3384e5a04a57fd9185eb4d8d3c7b77010beb54055a3058b5
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10424 bytes
SHA-256: 6bd2c2c73fa82647b8ecade6e8e266dc9da64ce06a86a329c73b046738dac479

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