Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d91dc4ef735c6b…

MALICIOUS

PDF

188.7 KB Created: 2020-11-13 16:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aec64431d7adf2223b57dbcdbf3f9c20 SHA-1: 3224566be3a1bfb7c1ec5956e0ed90896385207f SHA-256: c4d91dc4ef735c6ba0d8ac7726b1a3c79918e43f63b0c1b34e47afe38763f519
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure for free downloads, utilizing an SEO redirector. The embedded URL points to a suspicious domain, likely serving as a landing page for the phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://traffset.ru/aws?utm_term=uniform+condominium+act+florida PDF link annotation
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/lufawafun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f882dd335828.pdfIn PDF document text
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/6439459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8e3a6369956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9cf5a3e22be.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/f053173a-febd-41ca-bb80-8d04b0f4a845/tank_trouble_2_player_mouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd9bb4c-887a-4fb5-920e-8742f9d9177a/tapijigidizelorosererasug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fc2d81-c653-4885-90b8-3b1fee031887/dowonimefeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28ed02d-33a9-452b-9f3d-2a5ed2a5851c/jikasega.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/zavikelowegaxobeta.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_off0002a8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8F3 4980 bytes
SHA-256: 797d97d1aed5c705de1d718c28bb292038f27da9e0ac9121c9cbec7a7df2b17a
font_01_sfnt_off0002b9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9D0 12920 bytes
SHA-256: dfd0a5e4e085d31c335ddbc1d8357192c725eb7a22d9737864d26e6a0f60f7aa

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