Malicious PDF — malware analysis report

Static analysis result for SHA-256 a535a15ffc1d59ce…

MALICIOUS

PDF

74.8 KB Created: 2020-12-08 03:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e86ae7bf21ed13ea668fe6a86aa41e6 SHA-1: 12c712afc7c8b8516f9d87bbada09c75c1729f18 SHA-256: a535a15ffc1d59ce6b8d07859da667e069652aeb7d2217c02e7885f70d152ef5
222 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were extracted, the PDF structure and linked URLs point towards a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=immersive+creatures+monster+mod In PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/6662e52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1409b768-562c-467e-b329-227e4e6b1142/72709858219.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/database_management_systems_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe02b93c02f22b9dd3deb6/1606288058080/majestic_theatre_seating_chart_dallas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159e2223-4bd3-479a-9302-8403acbeeea6/29757836362.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc170aff7cf8c75402ec1d3/t/5fc380f208845d0924f6aef0/1606648050480/the_earth_on_the_turtles_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620d8768-4008-466c-908d-3bd90a4cdabd/mayorista_trapal_monte_grande_oferta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e28d18-098c-42f7-9248-a711e79fd3ed/fermi_level_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/french_to_english_translation_document.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/wusepojugewamirujuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8213f3e8-38ba-4bb2-b50d-eae3f6408be6/3_types_of_population_dispersion_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/bartender_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a73bb0-03bd-4e9e-9874-0c32900139d9/gutusefajogap.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/vassalize_guide_eu4.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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 5048 bytes
SHA-256: 0de2dd182b4d755005d2591f9868ffc717808401a6611bef62ddb50e8ab11297
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10648 bytes
SHA-256: c40242d7425a84d1101696cec87f9220a0e9595a15a12fd48841632d36e78b36

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