Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df1f47641ec03f6…

MALICIOUS

PDF

69.8 KB Created: 2020-11-24 12:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9ba938f1a0cd8527b09ea512832cfc61 SHA-1: 77bf574dfcd65e5a8c739cb133e8fba005bef7e6 SHA-256: 4df1f47641ec03f626e10b9ab588fc7f3e85c28ab4ee9072a156fe2189cbd472
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://traffmen.ru/123?utm_term=strategies+for+teaching+mathematics+vocabulary'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to educational content, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=strategies+for+teaching+mathematics+vocabulary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fa539fcbc675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8734e2e0a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fb8c2d99994e.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/luramamelolem/lereposinutikuminu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88aee277-e2e6-45a4-aeb1-b33658128107/77075980360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b750493d-ddad-487e-87f8-998348da153c/planilha_para_calculo_de_trelias.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/2263735342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604c445e-3724-44a8-8b73-3a9f480fa07c/medakez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22d02a2-0692-4f09-86d0-cd37aa313700/dumolapuxoxaseranoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a04b79-f4a2-421d-b175-1997ecbe2bb4/26979905212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8517f7d1-3cfd-4456-921e-ff3514dd2855/64491035956.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/hueco_tanks_climbing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b698fa-7b1c-4fac-9363-8d5de665c5e7/28439760683.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/pdf_flip_book_maker_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/fizoluvigekax.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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 5700 bytes
SHA-256: 21e34cf6606249633a77853b276e98f7adac69286756576a390558097d128c88
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 9696 bytes
SHA-256: 8a986e2c053bf05d41dd1bfc2fd203e60df80c7840f44ae101e918edd66350b5

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