Malicious PDF — malware analysis report

Static analysis result for SHA-256 776bb54efc5e3eb9…

MALICIOUS

PDF

73.5 KB Created: 2021-02-19 19:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aefb08f04f3e070895d28753c09620a1 SHA-1: 9cddccf700ed6142d27f3d44fbb439b36ca88c30 SHA-256: 776bb54efc5e3eb9c81b39f63c00ab8d7baed6009a15542cd2e8e967a4d02ea3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=life+cycle+of+a+leopard+gecko PDF link annotation
    • http://nikaold.site/droidadmin_apk_time95qh4.pdfIn PDF document text
    • http://kind-insta.site/barbell_back_squat_proper_formycifs.pdfIn PDF document text
    • http://1eyvgo.xyz/sibowazesibodr323e.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/dfea8a2a8393b.pdfIn PDF document text
    • http://phrensy.co/wulerajipofedubupinowakgpvmz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff4c2127fd03.pdfIn PDF document text
    • http://in-arenas.com/89395301537wswtv.pdfIn PDF document text
    • http://rusherx.studio/whatsapp_free_pc_windows_84iu5w.pdfIn PDF document text
    • http://markettop.pro/pure_black_wallpaper_hd8crtg.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/xetepasuzok-zesim.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
    • http://vozuxekeve.rf.gd/gukexubokekalurorineg.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/why_is_my_dryer_making_a_whining_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/vosufukekalomu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 4856 bytes
SHA-256: df0a0209f1d46eeeddb913c850114f19f4d3c214fdc2f9c5e58a0ca27926c9c5
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 9980 bytes
SHA-256: 81080499cd7d906d00017b8371f9eea72c1ce203b4447fd421566c501089bd0d
font_02_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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