Malicious PDF — malware analysis report

Static analysis result for SHA-256 d018c6523f3aa439…

MALICIOUS

PDF

71.8 KB Created: 2021-06-01 18:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5cbae83df788fd9ac797967284244eff SHA-1: 1659b5145c1952447efbb13d4c0392a5f2f0033b SHA-256: d018c6523f3aa43918a06bd7432369444fc8ee24c9a28bde7f666b18f3ceffe9
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://philabc.ru/pbw?utm_term=what+is+the+romeo+and+juliet+law+in+arizona PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fce89f50478c.pdfIn PDF document text
    • https://dojarugakafep.weebly.com/uploads/1/3/4/4/134471698/tojulidopezepibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60150db84aa45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_605a56abf1dd1.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/jupisozujevu-wimetet-vulukunigo-vamegaj.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/tofulilizodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_603d2704ca606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fce5f0cd2329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6039e94af248f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fde678d3eb28.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/wotitevobotizukuwo.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/589548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_6065bf320a101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_5fd2d3e073e29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natizasex.pbworks.com/f/business_proposal_sample_docx.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/ntn_flange_bearing_catalogue.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144420390/76751295618.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144446802/htet_2020_syllabus_computer_science.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426549/vevalosinagozisawige.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144458667/85302436427.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144411951/construction_site_visit_report_format_examples.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 5296 bytes
SHA-256: cdbff36c388b85dd526249a9b4d3f4786e54d8ba19cd8930ae872e2e7d7e08f7
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10568 bytes
SHA-256: dbd61e609312aad61a688d0df1b0413c164c116cba664331d3be694510d1b442

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