Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fee3a6841271f8d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 03:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aae26c4ef995c1a74d644dcff376c8bd SHA-1: 4ba4bf08f308a9b17e3feb9aebfad228a5b8ff48 SHA-256: 4fee3a6841271f8d61674a461feb5bcb1d70b991554fe0446243d45d2b80572d
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a link farm on disposable hosting and a redirector to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=endocrine+system+review+crossword+puzzle+answers In PDF document text
    • https://cdn.sqhk.co/vafodagusun/jcRGPdV/pivafakeluzalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fd8d817f0605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5ff45451e734f.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/cgghoPN/lasizuzovefuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fdc3f9af1fd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5ff4ebe09e2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_60224d2191327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_603e5d24018b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5ffe93c78622e.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/hfJjcjg/download_game_draw_climber_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/ek6p8m0/ixl_4th_grade_math_standards.pdfIn PDF document text
    • http://copyrightnotices-form.com/misixuxulanislfdum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60225f0133ce8.pdfIn PDF document text
    • http://crysety.xyz/alcoholic_liver_disease_pptkgmop.pdfIn PDF document text
    • http://ig-objectionform.com/full_body_stretching_exercises_for_flexibility0p8d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesexabipezu.epizy.com/kukafixogaloguneg.pdfIn PDF document text
    • http://jopununonigemo.epizy.com/punctuation_worksheet_for_8th_grade.pdfIn PDF document text
    • http://dudajulasur.epizy.com/92084562777.pdfIn PDF document text
    • http://varuxaze.epizy.com/cvs_blood_pressure_monitor_error_code_3.pdfIn PDF document text
    • http://sasaroguri.rf.gd/gramatica_ingles_esquema.pdfIn PDF document text
    • http://disefubukub.rf.gd/xokoju.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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5480 bytes
SHA-256: 00af241961bfa94f939c7af33be4edc8aa436130a13b43a0a053000591ee611d
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10160 bytes
SHA-256: 4936488d72a9ad3412eb08adb56e00d471c420c8afd562548a31f8866469ae2c

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