Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bb8d6f8decd710…

MALICIOUS

PDF

83.5 KB Created: 2021-06-09 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1bdd5fc79ed7a592bd0183e61a52032 SHA-1: 24790453d85c6a805e602f76349ba60f515a5434 SHA-256: e9bb8d6f8decd7102f40715e04d4fb8398eda104c7753d60dde96aa01b8f2ba8
186 Risk Score

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 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=resentment+aa+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481072/normal_602f00f418630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5fedcfbee8cce.pdfIn PDF document text
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/7310499.pdfIn PDF document text
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/wiwixeboselenud.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/fawixige_wumovunore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6050626548fda.pdfIn PDF document text
    • https://jufujepil.weebly.com/uploads/1/3/4/6/134650130/08dc5d.pdfIn PDF document text
    • https://zefowumuf.weebly.com/uploads/1/3/5/3/135327275/dikutave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_60bf2909c16e4.pdfIn PDF document text
    • https://javofosuzuvenew.weebly.com/uploads/1/3/4/5/134588543/mawikidel.pdfIn PDF document text
    • https://satizuluvom.weebly.com/uploads/1/3/4/4/134481830/fuveniwomuwalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_605bfbe7f0380.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/zotajewubaxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6059d94b66d6b.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/fidapugeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_60418ec054ebc.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/4848388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6015fdcc4f3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_5fe53d3cba875.pdfIn PDF document text
    • https://dawopebasigu.weebly.com/uploads/1/3/4/8/134886486/folerutelulozom.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/ccd53d3c36c0e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_60120a5ac60e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_6059134d91238.pdfIn PDF document text
    • https://zowerekogag.weebly.com/uploads/1/3/4/6/134672266/61f6b80b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5fef8ff8a8ae5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fce8bb58f618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 5056 bytes
SHA-256: 4f18cf6079183d4e3ebd85567fd8ad9f010cc07e37b46f390bc14dd8b3b30d57
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 13952 bytes
SHA-256: d30826af3d7252c3bc844c971f886dec3289231b1ab2ba2b9b5cf9adfb037357