Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0a7b5d033847f7…

MALICIOUS

PDF

77.8 KB Created: 2020-12-24 19:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 61be095e8f5b42a5f9fa79c1bd4cbc6a SHA-1: d03f061fbdef227033d49d8882f9ec46932754be SHA-256: 3e0a7b5d033847f7fd24d336175213a7f75a4c37e1e1ff9f1306797621c61524
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it hosts a large number of external PDF links, suggesting a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The embedded content, though heavily obfuscated, likely facilitates the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=stick+cricket+mod+apk+1.+6.+12 In PDF document text
    • https://penaletaxexek.weebly.com/uploads/1/3/4/8/134886030/7881007.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://uploads.strikinglycdn.com/files/a7796d90-d913-413a-bcaf-e37c045c127d/8.4_polar_bonds_and_molecules_section_assessment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/bulitunobusegopopoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befe1bdb-1572-4a36-89b2-bdd6c5dde187/light_dependent_reactions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80500775-b595-403a-a85b-d1d5184f3a8d/22840569051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc242f45-bef3-4497-9572-42c3664a32fd/75581326120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2471af7-d49f-4d88-b6a9-a09700b54f3d/gajabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091ead8a-bc5f-487d-a81d-2ed3fdf68bf2/16952301614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bab3d89-0fba-4ad0-8375-8e85343ac7bf/2390772945.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/litopezobuvunosej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562bb6d7-4ac8-412c-bdf4-899ca4075680/19970853210.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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 5228 bytes
SHA-256: 0d7a0c5d4d759e4d68c89d195f8bc81c5704fd515289ea9f9718ed58d7243f42
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10492 bytes
SHA-256: 6a640668d1f47c2b5f5311ba33e960d52c86d9b02d5eed448be56990fb214f44
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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