Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e907b10c785ae1…

MALICIOUS

PDF

75.0 KB Created: 2020-12-26 16:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0a08c7c93228192718491a7aa4b90006 SHA-1: d4e44b6ac5e5b209e9956bccd92fdad9e46765a5 SHA-256: d5e907b10c785ae153f81a01051618852b50bb4371806d41831e0d18825dc882
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of multiple links on disposable hosting suggests a phishing or spam campaign aimed at driving traffic to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=country+codes+philippines In PDF document text
    • https://static.s123-cdn-static.com/uploads/4503279/normal_5fc5559d65ad7.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/566034955638d20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc7339e8bfec.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/pebuzevopakufi.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/a308b6483e5.pdfIn PDF document text
    • https://dosarowit.weebly.com/uploads/1/3/4/3/134315771/e39d15d.pdfIn PDF document text
    • https://kelubipo.weebly.com/uploads/1/3/4/8/134891634/fidumofeduxo.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/6007913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_5fb2e6c9e08d9.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/jarawaxanivu/plus_loan_master_promissory_note.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/90412980292.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/manageengine_servicedesk_plus_msp_admin_guide.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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 4956 bytes
SHA-256: 498c9cfd34c52874c27ee946cd191e91c774cb8fd35bc452871e366dd582ebb6
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10708 bytes
SHA-256: 33cf3482b36e7acd7ed4a3ef7c1677c720c5b8f2e5fcabdbd8b4a5c390025f30

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