Malicious PDF — malware analysis report

Static analysis result for SHA-256 136b57bd1a8c74fa…

MALICIOUS

PDF

72.1 KB Created: 2021-02-13 11:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8443b3b71269ffd15ae7cc85424609b0 SHA-1: 844f1dfcdc1d5ce0c3468837f96c76c7cc3f8d6c SHA-256: 136b57bd1a8c74fa5837372656f415ca6abf390a0f42bdf0b07ade98541e1703
194 Risk Score

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/wix?keyword=forming+a+government+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_5fcb58861ac5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_600c096066ce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5ff60f896ac7c.pdfIn PDF document text
    • http://magnitoli-2ekran.site/casting_defects_and_remediesmgjnc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_60235830ef194.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/9hb2ide/juweduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_600aba77afa76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384832/normal_5ff36798a9192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5ff22994c2ab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fc8d71636c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_601fae7d9de39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_601542b78c677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_6008ca727c2f3.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 5236 bytes
SHA-256: 6f7136f59cc9da81686e9bd9a12fd4a78b4f838f9bdeed811024de8e83d975d4
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10160 bytes
SHA-256: 0288c883735156fce1c0ac04219ec696ed77bfec091464d835e627674ab20f65