Malicious PDF — malware analysis report

Static analysis result for SHA-256 643998c54dfe0aed…

MALICIOUS

PDF

82.9 KB Created: 2021-04-05 12:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 85245981fdfbf00d78538daee8eac943 SHA-1: a02f905b8a2567fd7b0afb54f52a38dfe1e12391 SHA-256: 643998c54dfe0aed0a697889435e7235ef8124e5c1c9fcc5828f643aa4c7a99f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=compex+sport+elite+2.0+manual PDF link annotation
    • http://zixaxagewan.mypressonline.com/2478113215.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/h4XFjhC/video_status_maker_tik_tok.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/jjgjhii/lumi_bitcoin_wallet_app_download.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/kiwominonilosukux.pdfIn PDF document text
    • http://nodalaxav.22web.org/drogas_en_el_ambito_laboral.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/ijejcK8/4612133367.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/diihcXM/fafeveb.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/7jfCtid/screen_translator_paid_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/f32jgcv/68579630519.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ebUzjaj/3d_drawing_basketball_court.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/jdHgfge/risk_analysis_definition_and_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/gghqK1L/dream_daddy_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_99bf70dd03b243f6aa23c6a518db64c2.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/91609304198.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/ponniyin_selvan_characters_cast.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_60fc55b3eb714476abeb4b08774e7e1b.pdf?index=trueIn PDF document text
    • http://moxowofabijis.epizy.com/chaos_daemons_codex_9th_edition.pdfIn PDF document text
    • http://zotinebid.epizy.com/child_support_agency_australia_forms.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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5244 bytes
SHA-256: b03474a7f12f9737e97c8674d0f87ca8f77c199979ee20c9aa7824783ad1fd0b
font_01_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 15312 bytes
SHA-256: 89cb68ac1b5ef9a2e7eb369bee424765e1e763f11b800b672f81c1d13f546e1a

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