Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f905fa31e4c6ea1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-12 13:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6367a89c1898a000ff4d8fbab1d8bc7c SHA-1: a8814d795d3ae4437f1b0d4076b819fe8705995e SHA-256: 5f905fa31e4c6ea1ad85c4c53415dbfed2bcf9b52147125ee6047931028a1dcb
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure designed to redirect users to potentially harmful content.

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://pelibifir.ru/award?keyword=el+camino+del+guerrero+pacifico+libro+pdf PDF link annotation
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/pitasaw-vapipogodijexej.pdfIn PDF document text
    • https://masiwirisiniziz.weebly.com/uploads/1/3/1/4/131453333/nobofaxis.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/bredesen_protocol_diet.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/legend_of_tarzan_full_movie_online_frees8nkb.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/chiZQja/24661492248.pdfIn PDF document text
    • http://yozi.store/calendario_laboral_2019_catalunyai7ji3.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/30891276685.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvakumo/4UsraN1/46041686666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_6038352569cc9.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/297fe.pdfIn PDF document text
    • http://agentsecure.space/rozezitemef9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fe7a0437145b.pdfIn PDF document text
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/gudubukuxidedupi.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/929c6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fce124c1200c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a98c137-860d-45f7-8332-bb751c19177d/vodavi_starplus_sts_3515-71.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911a99a5-da10-4db4-898f-2af7198c27f6/how_to_program_a_panasonic_phone_kx-t7731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc46496-1492-40fe-ae68-346b72c382e8/como_interpretar_una_fotografia_aerea.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_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 5396 bytes
SHA-256: 970a59b5378e2c549fff9c129fc442591ec6f57687f5ccfce40f84c248b53810
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 11332 bytes
SHA-256: 893871049b0a683555a41f25a854c38cddb1c923051c653f08ea355436be6983

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