Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5dcfda5baee941…

MALICIOUS

PDF

65.1 KB Created: 2020-12-23 20:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1adbce06cd31cf55e28d21a9530d011d SHA-1: 8f9880fa7221d20f2cc25a64c62290bcde27885a SHA-256: 8e5dcfda5baee94126dd0fd3be814e4d3f3df1fef2cacd5b37a6885d92ed2008
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a game guide, likely to entice users to click on malicious links. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS heuristics strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ggtraff.ru/wb?keyword=naruto%20x%20boruto%20ninja%20voltage%20guide%202020 In PDF document text
    • https://midoninojun.weebly.com/uploads/1/3/4/6/134665084/9872259.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/jhh7jcd/best_black_friday_basketball_shoe_deals.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/37534e1125259.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/2390918.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/fhfjegd/takokigetagovuru.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/dhbjijf/dental_assistant_salary_per_hour_california.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/49656e88-7f34-4b9e-8b9a-90bf945ff87d/litarexuwexilano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8130cc2-96ce-4e57-8e9a-5b24b030d426/kabezijadirij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096ee1f7-9e73-44e4-a2b8-ff20797b10e5/18796975269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ce247f-7649-4d0a-8402-7674061bb786/one_step_inequality_word_problems_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eab27aa-a500-4bf1-96dd-701cdbb63b76/96224817652.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_off0000ae80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE80 5784 bytes
SHA-256: fa1f9618c508e2ef7978c330dc2205bdb4ebd3410df82668697b45acaf615f88
font_01_sfnt_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 5400 bytes
SHA-256: d61483809ef0842ad5d77cdfe2366640da6a68f50181cb42fbb40df5c0dce8e8
font_02_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10072 bytes
SHA-256: 8863f98c9669d32ce0b30fd7e4050680224cae3d8c44022eb545d70ad96ed183

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