Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c8e0f1a3ace92c…

MALICIOUS

PDF

95.3 KB Created: 2021-03-15 04:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fbf9347d3b370892862658628dbab64e SHA-1: 8b16e29aaace181348b8ce4f5516459eeae07454 SHA-256: 17c8e0f1a3ace92c7e239cca410cd4618984412d650d6ad77669b6b8fc50bcea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://jottigo.ru/strik?utm_term=advanced+trauma+life+support+protocol+pdf PDF link annotation
    • http://winclean-shop.space/zisupopitonevjc6pt.pdfIn PDF document text
    • http://starconflict-game.ru/xidilox2x6qz.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/vifoderawuzejatatde464.pdfIn PDF document text
    • http://shoop-fh.ru/327661064423uf1e.pdfIn PDF document text
    • https://nelotimef.weebly.com/uploads/1/3/2/7/132740277/nanagovezi.pdfIn PDF document text
    • http://crispyset.online/xokujozopuvozeumfp0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_603d1363266a5.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/98233542626.pdfIn PDF document text
    • http://stroiline74.ru/jatikuvitodudakidovilu3io5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fff6f6f4d8d8.pdfIn PDF document text
    • http://skout.tech/easy_physics_demonstrations_high_schoolu7zji.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/4d46fa32428033.pdfIn PDF document text
    • http://razidazimako.iblogger.org/84513220407.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/bidesobibomuguposavevig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipabiz.rf.gd/marx_communist_manifesto_cite.pdfIn PDF document text
    • http://wavedada.epizy.com/minecraft_auto_clicker_mod.pdfIn PDF document text
    • http://kutoduno.rf.gd/41119396910.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_off0001391d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 5352 bytes
SHA-256: c4a047367c14fded1c16f20ed0c9f272cf562ee9bf99657dc43dbd228ffaa4ed
font_01_sfnt_off00014b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B43 10792 bytes
SHA-256: 899231a08d63d3b2ae1503e92c1f810283cb964d14794b8a26b8cf7e40ed9810

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