Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c54731bc13b8e4…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 21:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ed00f7093691996b467e77d65d8bf7d8 SHA-1: d3aedb54d0353371a6d9449e861c5681979eeaff SHA-256: 69c54731bc13b8e43c539b6c2b5203849d19082d10eff0912abbfea6982d14d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external sites. The presence of external URIs and link farm heuristics indicates an attempt to redirect users, likely for phishing or malware delivery.

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
  • 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://golowaki.ru/strik?utm_term=que+significado+tiene+la+corona+de+adviento PDF link annotation
    • http://tixokapine.mypressonline.com/what_are_the_complex_solutions_for_x2-2x50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600a3b8e7a848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_60085101a5728.pdfIn PDF document text
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/84b8cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_600bfc05617d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fe21965dfcdc.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/fd4c94a46b8895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6009e1898d129.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/wjdf6gj/sufage.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/iogeia0/halloween_wallpaper_cute.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/jumping_jacks_play_area.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/cules_son_los_sntomas_de_pncreas_inflamado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://salajire.onlinewebshop.net/jlab_bluetooth_headphones_walmart_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/68076015484.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/marketing_plan_template_for_startups.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/dononerovurilo.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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5308 bytes
SHA-256: 146297ec368db42b82e0ad126cb1c8ecd8a948e1c82ddb8eccebea17fa079672
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 11856 bytes
SHA-256: a4682fbb9ca3a042df0beb83a0c74d2c8e439ebed81ec0500ba17ead476f0c0f

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