Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3958e6dca6e7f92…

MALICIOUS

PDF

71.8 KB Created: 2020-11-14 19:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 75fd111c3b2c53862cbce84dc0d605fe SHA-1: 25ad1cdcc58a5a1e9950dc15219ff54a7c91c305 SHA-256: f3958e6dca6e7f92b02d4d3ca9a01480dcec42a07865a5770ca1ef643ea78b4e
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cctraff.ru/123?utm_term=the+circle+game+song+wiki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f9c5c9b2eb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f8f187b29a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f9b7d7200ad9.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3079835.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/mozirolinitaje/naxotivepavedalezikeveg.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/jakabeniboru.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/91728110448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42721f3e-16bd-47f5-8775-daf7b48cbe36/jesid.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/siwevemorodidew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c896a229-93e4-4547-a886-dc6441fd6d92/simplifying_monomials_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/88727613424.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 5320 bytes
SHA-256: 7aaade3c9ba9e346604b797179380452f289d67d2067ed114bd55e0430fd5a53
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 10432 bytes
SHA-256: 01f00fc78d9d042a1720e0bc14083beef3fad888e561f25e9efdcc145053b6f4

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