Malicious PDF — malware analysis report

Static analysis result for SHA-256 758357bf426ecaa6…

MALICIOUS

PDF

64.2 KB Created: 2020-12-03 14:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 76b1451c665cc7963b2fdc84628c4a5e SHA-1: e50e7a70bc9e17e87d8313f0dafa791e6c6eacd9 SHA-256: 758357bf426ecaa61fc6a02c23c37f3e71b4f88064cb2955f0f18059e3a262c9
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 and an ML classifier, indicating a high likelihood of malicious intent. It contains a link that redirects to known malicious infrastructure, disguised as a 'techno commercial proposal template'. The embedded URL is designed to trick users into clicking it, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cctraff.ru/aws?utm_term=techno+commercial+proposal+template In PDF document text
    • https://wedagibawarog.weebly.com/uploads/1/3/4/6/134680751/5107425.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/lukojawopuwopewenatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f90984e30281.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/a2650cf0-c819-460b-9a82-37022dedacd7/dunmore_dmv_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/76085714442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f855f876-3fb7-40c0-be54-f0e7d7f5200a/44554549864.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/27450399340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34685e39-6502-4138-8e23-c4e8c279697b/mn_rule_evidence_609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b79fb1-6051-457f-a438-7832960d902f/91378797476.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_off0000c04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04F 5124 bytes
SHA-256: 61dd349784e6648c64cce436e06689f3e7e0face99a5271063322bbb7cca0130
font_01_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 10196 bytes
SHA-256: 33a246775d8345dacd13e0bb0cac8a060a732621a236cf1dee7756fd41cf593f

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