Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a739e7060062f2…

MALICIOUS

PDF

71.3 KB Created: 2020-12-24 09:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f9d73377992b21ddda08dfa67f9f16ed SHA-1: ba9359b545272bb412d039eb9b5c95c294aee0fb SHA-256: e4a739e7060062f2ea487dea2ab5e430bb160a58451ad91d160d004213731ddc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the presence of numerous external links and the 'Pdf.Phishing.Trojan' detection strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=minecraft+0.10.4+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8929d9cd9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f88ad4d0ba58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fbf64cb35f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5fa1afb9eebdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f961f2f4d7a8.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/tokopedasav.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/c7fafefd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_5fd9771d43f57.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/KjhghvZ/tasazirutaxikaxuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/ha1PhaQ/mawojenisotasikurubof.pdfIn PDF document text
    • https://kazodorog.weebly.com/uploads/1/3/4/9/134904699/jokijijido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 5184 bytes
SHA-256: 144644a65a9497d23e30a5579d980c88b180e7ba48eaf8810ce91eec2893859a
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10448 bytes
SHA-256: 6f294b0db4b4b47efb31e3a7f2e3162bf36d96c0b23991b667f3ba0b2c3c3ebb

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