Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f4a2381ffda98b…

MALICIOUS

PDF

70.3 KB Created: 2021-02-11 20:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b27ac563a67d2345a0d367dec7ac8ee0 SHA-1: 63687dc32061ac35da1d7d724e2afd29f40c9310 SHA-256: 20f4a2381ffda98bf09fc5183a7a9cf53d44866bb25e250f7e56bae71e305f9a
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=elizabeth+burgin+family In PDF document text
    • http://winsbig.space/roco_10787_manualr28ux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448750/normal_5fc71d4a89321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5ffd5de68f47a.pdfIn PDF document text
    • http://powerpoint4you.ru/79529809332vj2i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fee41af88c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5ff6c5a6755de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fce5e9a69359.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/tarajix/350z_auto_to_manual_conversion.pdfIn PDF document text
    • http://poxemibusap.epizy.com/morfologi_bivalvia.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/semi_block_style_business_letter_format_sample.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 5252 bytes
SHA-256: 33e91492927fd1695419820a9c0bebf40f403ae57b950d18146ced183894e7ce
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10144 bytes
SHA-256: 0a26cd7e71c18c190a6c3bcf2e704da9f0dbd8e4a47466ac065efe71c5c3d0bd