Malicious PDF — malware analysis report

Static analysis result for SHA-256 721c01b8319470d7…

MALICIOUS

PDF

114.1 KB Created: 2021-06-07 04:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f6793da71a92b7a07ae75739fe0d1c7 SHA-1: ec2c95b1a6fc748966d1f284e84e14be691a7bfd SHA-256: 721c01b8319470d7400240f2cef829ed4ac7b4870ecac3a67942b3ba2bee5a9c
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 0.9997

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://queure.ru/pbw?utm_term=free+online+cpc+certification+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454982/normal_6049338756cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_6018ee51f2105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_604f62a9b67b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_60637f2ac50b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6063b48e356be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fd11cc61fc4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_601cf0a4b12f0.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/mikoxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_603874ef0fa2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382778/normal_5fe15d6dafd3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb2161b4129.pdfIn PDF document text
    • https://wojaluzuzuduku.weebly.com/uploads/1/3/7/4/137498881/najedes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed6c951-66b7-48a0-b655-8712af45fad4/16468006860.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/81486209624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24a7f24-60b7-4b7c-99f3-79a11f9394a0/zugilavomomug.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/wasozaselobo.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144414363/samuberu.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/21975967925.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001746b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746B 3352 bytes
SHA-256: b70882b8fd4253cd7c22e051a160f368e052dee56201b744ccf335e0bea06c39
font_01_sfnt_off0001806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806B 5380 bytes
SHA-256: 79135c83e4d312599f73e18c23bb60401aa133a6eefab4ad5ae82cf3da8024cb
font_02_sfnt_off000192d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D7 10936 bytes
SHA-256: bfffb7eb87f8235978e159ba37ea2ac2612948ae7e6e3ab2a2ad3fabe8239a11

Open this report in the interactive analyzer, or submit your own file for analysis.