Malicious PDF — malware analysis report

Static analysis result for SHA-256 8884126b74155ffe…

MALICIOUS

PDF

82.0 KB Created: 2021-02-20 07:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42df5e62efdde80136f626d987d2ae1a SHA-1: dda9c538f3dffa22f9de180409d783f085e1d64e SHA-256: 8884126b74155ffe047218d7fab0e417944dcb4bf1121063592e0658a6bb7844
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector for phishing, linking to the URL https://jacksth.ru/wix?keyword=fortune+social+link+persona+3. This URL is the primary indicator of a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=fortune+social+link+persona+3 PDF link annotation
    • http://kayikciakademi.com/choosing_the_correct_statistical_test8xde4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_6009bddd125b2.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/GBtheEM/sibawajedomiwuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hghFjh4/gujafexav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5fe5a97bd89c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fe032b928d36.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/nWggiij/91300766851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_5fe1273e5e967.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/26q6Bhf/jet_ski_water_speed_boat_racing_3d_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fumiposamisur/student_registration_form_bootstrap_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/72953628858.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/gafadedizajagetikidotugi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/cdpq_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/barrios_julia_florida.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 6164 bytes
SHA-256: d870e993e64c496239d7cf96ac21e6cd9d1a27e8b93d291d00730e92dbf09257
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 4992 bytes
SHA-256: d0dbd49fdf170f4648062416f2f37c4e183bebd2aa6248f09ba95cc17f15eb29
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10104 bytes
SHA-256: 5729d6847302ee537305c4d41d3936c663fb9fd727558ede8963273eff8a0d02
font_03_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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