Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a5f70dac23ff69…

MALICIOUS

PDF

73.9 KB Created: 2020-12-19 06:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f92d14af0f7ab6c8dd63305b191e0857 SHA-1: ed90851077205591e5c6d001e770f220e3b55eb9 SHA-256: a5a5f70dac23ff69232d3f67516bfc25a1e1b7080510bcba1c9e31f6ef5b16d3
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The primary malicious indicator is the embedded URL which leads to a redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=anima+beyond+fantasy+pdf+fr In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8d1956035df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5fd081f3a064f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f89f89e93ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5f92358f52d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_5fafd0eb01ba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_5fccaaa651fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5fd638cb0a51d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f8f679d1c699.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/c9eb6ced-34e2-46dd-a92e-081756ab745a/30904034618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f52dd88-990f-4f88-b613-2a7fce56e6f9/liberian_pidgin_english_interpreter.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5384 bytes
SHA-256: 096f980b5b5f86ec7e3ae5be8adccb074a10dc1c3a740bb2f312668a4d48f9d2
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 12240 bytes
SHA-256: 5e1db365cdb9462583e7cfb30481d852b566ac10f72b9a377590b64283cc58b1

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