Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c88811f54b381e4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-15 03:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0ceeb77d5e23c1bbd859a94c2c8df0f5 SHA-1: 179981587b2ecd34e94ba1cc271ed983656b7af3 SHA-256: 6c88811f54b381e45f6b9d9e97a6b86076ef7762e90e94cd03ad8cb179ea9cd1
186 Risk Score

Malware Insights

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

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 6

  • 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 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://mezovuduw.ru/wix?keyword=reactions+involving+acids+and+bases+worksheet PDF link annotation
    • http://budozezofezuje.iblogger.org/crystal_report_c_winform.pdfIn PDF document text
    • https://tegotaxuwore.weebly.com/uploads/1/3/2/7/132712324/geloxuw-nomokidiliros-bugimujuteli-samazanesi.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/is_there_a_book_9_of_outlander.pdfIn PDF document text
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/5d1f643e4fac.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/mokoxir.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/7860630.pdfIn PDF document text
    • https://dimazupaw.weebly.com/uploads/1/3/2/8/132814154/wanoxabefubimeg_jazot_libosug_zaririkelu.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/camino_primitivo_gronze.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/1fa982cb9b6896e.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/zonivezada/6070227877.pdfIn PDF document text
    • http://lujolugajejizog.epizy.com/19547538204.pdfIn PDF document text
    • http://wexoloxi.rf.gd/gukudalutejagamuruj.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/fierce_conversations_worksheets.pdfIn PDF document text
    • http://bekonoxidolu.rf.gd/how_long_do_you_have_to_respond_to_a_motion_to_dismiss_in_florida.pdfIn PDF document text
    • http://fifomivosa.rf.gd/google_animal_video.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5564 bytes
SHA-256: dcfef5cda873690069928023dc7397cc5bc964896202f5deb573daeaf7cf2e67
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 11616 bytes
SHA-256: 351786463e845155372157cb94f0b30bd01af38c4243dc5e7ca11bbde852a746

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