Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3722a66a97ad73a…

MALICIOUS

PDF

79.9 KB Created: 2021-05-08 22:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 56a027b487804c3cd5a19085706499cc SHA-1: 1c7f4cfa5348c1bb995fe77b64d31fa108a5f115 SHA-256: d3722a66a97ad73a9ee0299f0a79cb4c8e68f2bc860497c8aadfc384ca9aee9d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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/strik?utm_term=diccionario+ingles+espa%25C3%25B1ol+pdf+descargar+gratis PDF link annotation
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/towax.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/KLjfggU/how_much_space_is_needed_for_50_chickens.pdfIn PDF document text
    • https://kaxaratit.weebly.com/uploads/1/3/5/3/135383379/sajokunufela.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/jutubu_dibutufixeruxu_vuwep.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/dgchdCf/batulaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/dGviiog/67356329881.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ap1ifjd/dictionary_update_python_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/hegh6hc/9020583504.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/2ge40Bm/gekulomopena.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/kpKJwgj/ruxafudogopetanujewip.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/eYDYfYF/97332502482.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/jdjfXgi/sample_checklist_word_document.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/5932025.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/ifunNgh/hit_and_run_tractor_trailer_accident.pdfIn PDF document text
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/cc5159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/joterige/2068397632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4454e2a2-620a-4b6c-b6f4-21f32fe2756f/ninusebuvukosar.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/balebolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2848d4-6964-4e3a-a644-7a34d7957623/datowulogepivakalij.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/bhaijaan_bangla_movie_full.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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 5536 bytes
SHA-256: 73e5f060619498ee7f8c9b884c554ce91622f6ffadd700eea1cefa2ed96f079a
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 11872 bytes
SHA-256: f304f7dccc3a3d472d7e64490bef8760ec9d354b58e40d68d222a494fbd60fae

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