Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41134007f365f2b…

MALICIOUS

PDF

76.3 KB Created: 2020-12-26 04:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2b9c8ce16edf560b553a7e560b8db0e1 SHA-1: 9cf2d7ecd295032c09d431f96f4ff0390c0272f1 SHA-256: d41134007f365f2b4ae1fc8e6c79811b03a6ec37a1666e5be9d57655ec1bd0cf
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is likely used to redirect the user to a malicious site or download a secondary payload. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=sports+trading+cards+stores+near+me PDF link annotation
    • https://cdn.sqhk.co/barugogip/hjjiiaw/manuzatenunelodofusafixum.pdfIn PDF document text
    • https://mufudenufasos.weebly.com/uploads/1/3/4/4/134492520/8534676.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/daxedib-pobafuwokogom-kebivepib-fawivinafivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_5fb2a336ae2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fc0918517d08.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/gh1jeJu/nuxisomofufedalewekap.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/xukanomarexumu/46151497.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/biota_laut_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd59cbc9-9475-4d6c-a8ef-f79bf79f682e/jutovetirabudikudige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d65919-d11d-4dd1-a747-1e23724ffe1a/56089170407.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/lifipexokoveza.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5464 bytes
SHA-256: ee0c650df2a1097749715e9cd65377ed80fa644bd95b43e36411fedf34e73a93
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10672 bytes
SHA-256: de496f50b95641e67d946f529bedc1c6c1726dd385c97a6ac7cd4a809c46b150

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