Malicious PDF — malware analysis report

Static analysis result for SHA-256 f454d3054a98e6b0…

MALICIOUS

PDF

65.8 KB Created: 2021-02-10 03:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 69a487e5c939a623d085ff7a93cf1c7a SHA-1: b3fe5704369e39a3b0dfadbc42aea64d768057f9 SHA-256: f454d3054a98e6b0db8abcf16e05c54222c36dec8e67e5d49b72454f444471e0
134 Risk Score

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, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=letter+s+tracing+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/xilelawemu/iRRQjfA/world_war_two_propaganda_posters_uk.pdfIn PDF document text
    • http://gufutaca3.xyz/10736778335n41ah.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/kaguditiwanik.pdfIn PDF document text
    • http://gratoramaa.website/liquid_waste_management_systemj4rcy.pdfIn PDF document text
    • http://islandlandscapesbb.com/blade_golf_clubs_for_beginnersztqkt.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/defizaxufuvofofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_5feee4f00e743.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/2514632.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/jaBSzib/skylanders_trap_team_all_crystals.pdfIn PDF document text
    • http://alexsaf.ru/costeo_directo_y_absorbente_excelovtzx.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/ieaoNif/mechanisms_of_evolution_activity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5ffb4ca245ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd8beed6a08f.pdfIn PDF document text
    • http://tiktokfrance.fun/xadofijujawu5vj5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwanozofugis.epizy.com/pdf_to_word_converter_online_free_candy.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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 5480 bytes
SHA-256: 5c1e6262731896568cfe446c0bdeba1477a5963572d1132f1dd7cf45703431c4
font_01_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 10400 bytes
SHA-256: 7435dd3ecebfe4d158e3bd6da4e434b70f66af60fff47979f50690a619504d22

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