Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b18f30afded64…

MALICIOUS

PDF

75.2 KB Created: 2021-02-23 06:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a86e60259dd5ed12e7c89d059ef5729c SHA-1: da3a2e575fafab219c946b0bcfdee7e0682cb03f SHA-256: 627b18f30afded644ba56ecfdee2b7bd73d1a836a346caf964aee8b2a0ae1868
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' suggests the document uses an image lure to redirect users to a phishing site, specifically identified as 'https://seumenha.ru/wix?keyword=hero+3+user+manual'. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it might have been generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=hero+3+user+manual PDF link annotation
    • https://cdn.sqhk.co/girolivudafo/j4jciwz/quad_squad_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/9WCgeih/25932511870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601e908892b22.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/icNhjmL/warepaleverujezaxatep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_60333379a1807.pdfIn PDF document text
    • http://toredakaf.22web.org/bejipipatinugetemujosulij.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/sdieijh/hot_rod_lincoln_song_jim_varney.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5fe17efebeea6.pdfIn PDF document text
    • http://kulokozataxat.22web.org/50225662859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5ff5a7eda369f.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/mevuzokekenojab/47635407376.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/46134920155.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/diagram_of_respiratory_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/bagokibogemesusij.pdfIn PDF document text
    • http://fasilew.epizy.com/benny_dayal_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/molodufib.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/71729696073.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/57818507576.pdfIn PDF document text
    • http://mukadepokexow.epizy.com/axa_ppp_healthcare_cancellation_claim_form.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 4956 bytes
SHA-256: f0496e7ff2bf334d24ffaeb49b9ba5396724908528489d0863a2590a2d6b55ee
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10588 bytes
SHA-256: b45e72958b63ffbc4eebd64be7a9cef4520ac44bde5d1fa1454c487b82fd531a

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