Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c5e519a17d9d13…

MALICIOUS

PDF

62.0 KB Created: 2020-11-20 22:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 74e18a32d8d7559e547526780bb9f858 SHA-1: c1c8be6a9926d2e22844b01ff1d54d086ed0ea67 SHA-256: 55c5e519a17d9d13eed09b7f9768717489941804ace81dbba7d6636ee8182029
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it is a redirector link used for phishing, disguised as a prayer novena. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure to download further malicious content or conduct phishing.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=st+lucy+prayer+novena PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8f13538c771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f92043bd5590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_5faa36df1281b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f957cfe70cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f91768bae03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481819/normal_5fb77acc9d36f.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/xabalaru/29436302241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7ca81a-448c-452d-a3c8-ea85a58392b0/xumejelapegufuxekenus.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/futirepewelasijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/xodiminilajajus.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/ftc_robotics_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/28048553699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abee822-d590-49b8-9144-e398471aea19/tizumudus.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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 5012 bytes
SHA-256: 9781a9a7c8d3ecc7f1995c2e3a4f9759bf3ec9f8397c9e4dc6309907067777b8
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 9256 bytes
SHA-256: 94232caffc8a1971e773b02f1bd941ccd76ab88e0d20bd3a4bdfed2b60f3bd18

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