Malicious PDF — malware analysis report

Static analysis result for SHA-256 b549afbad3cc9328…

MALICIOUS

PDF

80.5 KB Created: 2021-02-23 03:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6990a3b9c9ecfdc7b7042089800b6882 SHA-1: 534b83e8347554cf2ed4c29cc7c50df9f2870d21 SHA-256: b549afbad3cc9328bd037d94398791dd2ba3f3e463156abff51a91882e8fa26f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, indicative of SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

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/wb?keyword=what%20is%20aggression%20a%20sign%20of PDF link annotation
    • http://valamivu.22web.org/sql_server_2012_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fe57db2bdd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_602aa9781671f.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/7e23df.pdfIn PDF document text
    • https://zitupakunetod.weebly.com/uploads/1/3/0/7/130739751/9c4bf71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fdf1734e5e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fd0be8761738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ffdb166d6327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd761439d547.pdfIn PDF document text
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/samozev_timul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/7th_grade_math_test_worksheets.pdfIn PDF document text
    • http://kitakel.epizy.com/piwotugutovesapere.pdfIn PDF document text
    • http://batefagut.epizy.com/blackboard_collaborate_launcher.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/johnson_controls_financial_reports.pdfIn PDF document text
    • http://zofutigo.epizy.com/vocabulary_synonym_and_antonym_worksheet.pdfIn PDF document text
    • http://poxipepeti.epizy.com/can_you_use_nuna_pipa_with_uppababy_vista.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 4800 bytes
SHA-256: 01dcc40cff47a28d063a2eb09c1890750bebc545c0824056fec10fb36713022c
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10868 bytes
SHA-256: d3b751bfe9cd209b7d9b007afc8569ca4a4759ea2550b10e046de45c4222d763
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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