Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a38b99bbc8002dd…

MALICIOUS

PDF

58.7 KB Created: 2020-11-23 06:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e0a24597058935b6c5ae13d29e2822a SHA-1: 3685891e01f0444349d92233a638a5c6da97fd9a SHA-256: 8a38b99bbc8002dd9b8dc6f8b9f426eae761e2d8c50007b5c3783afc05d78648
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a ClamAV detection. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious URL embedded within the document, which is likely used to lure victims to a compromised site. No scripts were extracted, but the PDF structure and redirector link strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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=compound+areas+worksheet In PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/7869015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5f99784d56e3f.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/5829299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5f9a5e713fb7c.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/d6a66697-8ff6-4f5d-8b11-c74f2b898f50/15694451059.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/2020_annual_calendar_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ef3a5a-7904-4a05-9520-f40391e05bf4/pavegifeturimopofakuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/smokin_joes_cigarettes_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/48433160206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc82a16-5067-4d0c-8b3a-285b1f39e6c3/sogipakuvebimu.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_off0000aa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA3C 5228 bytes
SHA-256: 078c72e066801635833376eb1bc6f6f90f698f7bf595e176a996ee8753ef8fda
font_01_sfnt_off0000bbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE2 9732 bytes
SHA-256: 21589bd459cd86e9c1425610d916a47325129c67d12f41b38ded91605b80bdf9