Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a3002a3991df4b…

MALICIOUS

PDF

66.0 KB Created: 2021-02-13 10:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf7e662bd8631907bfd8ad7bde4753b1 SHA-1: d9d4ef677c04d4896b768bf502416dd1b2192d5c SHA-256: a6a3002a3991df4b712969710a53dfeaa968be5a320d9efb7fabc722d2ceb1ab
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://druttle.ru/wix?keyword=practical+emergency+ophthalmology+handbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fe0d523792d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/eWhgghN/audio_pro_addon_t10_specs.pdfIn PDF document text
    • https://zusebogodi.weebly.com/uploads/1/3/0/7/130740375/megowusezorevik.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/iS5tsbA/xapawobe.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/lofeza-dezixiw.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/jepamu.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/nanasulegumazidanisej1fpi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459792/normal_5ff9883f2259d.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/hbiaje6/21799052639.pdfIn PDF document text
    • http://everydays.space/wazereromezinenulupl3n3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fe89e8dc6a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_6017a67d09f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5fe7ca58f3e18.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/1938335.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/cdcb5384b29f899.pdfIn PDF document text
    • http://italylife.pro/78097868549xvpoa.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/fovezewi/refraction_ray_diagram_worksheet.pdfIn PDF document text
    • http://gikutixutawax.epizy.com/apc_smart_ups_600_manual.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_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 5696 bytes
SHA-256: 3f51f0c6c5e805f9f90dae80ef852c45945eaf0721b03e7e714a3eb9282a560b
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 10224 bytes
SHA-256: e1e407902d6200114140ae499ead0d45bedec5d31bcb44740ed748c89d34b3cd

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