Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66cb440d474e955…

MALICIOUS

PDF

73.5 KB Created: 2021-03-11 09:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a5465d00b0195baa8d149b83345062c SHA-1: 8eb183cefda1936ff5c04c679cfae0663117e0a2 SHA-256: d66cb440d474e955d976d168de18bbf841c967d87e3608bd28b57e4e6ba4c8be
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 detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it uses an image lure to redirect users to a malicious URL. The embedded URL, https://botokaw.ru/123?utm_term=bach+arioso+violin+and+piano+sheet+music, is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it exploits PDF vulnerabilities or uses embedded JavaScript to facilitate the redirection.

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://botokaw.ru/123?utm_term=bach+arioso+violin+and+piano+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5fdfa880f0d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_603f81f3158b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fd11d01d79ae.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/8721adb4-e921-4b20-ba8f-7fe026772c55/what_is_radicalism_in_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b6088e-c67b-4ac5-90d0-ef1becade801/sokanoz.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/zasoluvumomepi.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/7117653022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4013713d-7e70-4d73-b0d0-e397314e0b4f/zuxuxozapeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db789a1-292c-4683-b908-aa620b5aace2/how_to_interview_a_dba.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/89665636931.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/nokupifuduxiwutuneruwozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603cc1ce-7c0f-4733-9765-2ea8120c0a54/4970969687.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/binimuramatos.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/22910680020.pdfIn PDF document text
    • http://keputeka.epizy.com/33541469889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d52935-3ac8-4d9b-b20b-8bd44367eee5/eleanor__park_age_rating.pdfIn PDF document text
    • http://jabisuluro.epizy.com/autodesk_alias_design_surface_speedform.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 5424 bytes
SHA-256: d7c6f32f6e09ca53b77d2ef8445b9c01a5afa8fab170c660a8a752277d8eeb6b
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10420 bytes
SHA-256: 3f40d48be14ae30a6fb13a0f7933196d2cdfcf9c17d5bcf2095f1cacbeb27520
font_02_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b

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