Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afa8930ce468690…

MALICIOUS

PDF

69.0 KB Created: 2020-11-21 22:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d28a2b69127c00dc651ea72e1fd22269 SHA-1: 8734b1e57f5a8c6370ac86b3b4edfe77bff8a101 SHA-256: 9afa8930ce468690d7a043d80d10c182ccf4bbb76fd60984d3efeff91e416c05
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to prompt the user to install a fake browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/aws?utm_term=how+to++facebook+videos+chrome+extension PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f872299dd830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8730ff83a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5f970856c4927.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/pazovugal/penyakit_arteri_perifer_oklusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d3d481-7354-4549-91a3-e4758f5d95c8/balsam_hill_coupon_code_that_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57242a2-52b0-4372-8eaa-ddb9e3e7a32f/97204105694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc935d51-5e72-4f86-9b29-139041ba23b8/84838786517.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/rmoms_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa068fa-a9af-4423-a3f0-d9151f13672a/magic_bitter_magic_sweet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/86491347886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b7ddc3-ea73-4b69-9607-27e35601a36c/mabofiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d986e948-9e77-418b-b2f0-c7764e6bd504/80142427437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33bbbd7-6831-49fe-b088-4039ae3790d0/losujibixugukag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb95aa7-08d5-4748-896e-5ec135612ff3/54685879025.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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5612 bytes
SHA-256: 5a28f9bef15cf7c877ffe4efb0b5d9fbcee1dbfd9f7b20584a280656a5f6bc6b
font_01_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 10376 bytes
SHA-256: 33d5acdb880faf25df7209fee905914761fab976426eb7c4de1e6dd2e1c06a43

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