Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a870d98821ce7ad…

MALICIOUS

PDF

83.2 KB Created: 2020-11-29 06:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0c463388748d9b370a1bfcfc7b8edda SHA-1: 08a708a29cdc727f7a01ac84c8492541d529fc24 SHA-256: 4a870d98821ce7ad4a185ceea64f4619865d10c5d950a1b444b795f0c0bb854e
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to style guides, which is often used in phishing campaigns to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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/aws?utm_term=chicago+manual+of+style+numbers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5faa7086e8974.pdfIn PDF document text
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/tepamubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f893b2d0d5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f884c70e4164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fb89c8a03764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5faeb79596297.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/83549f68-0fc9-40da-bfa4-d83284d280c8/ankarali_ibocan_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49baedb2-70dc-4776-ae1d-9901f9c26d33/renaissance_cest_pas_sorcier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f25ef1-363a-4dc6-a181-75460a78868b/42007360888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa70960-f54e-41b7-a642-46e44d333c5a/43101312410.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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 2996 bytes
SHA-256: 960cf9a134e76462ce778d3e162eb277013475a2447d87a579c27c9cf2ab984e
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 5444 bytes
SHA-256: 752730453460f676f7c08645e323bff34f04c548b52d8d3b0aaeec9deccd4c83
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 11876 bytes
SHA-256: 199001ebb4e54274d2d7baed2310e8ba7930e50e8a2c1b604f66a44d75a47bc5

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