Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cb212057292bba…

MALICIOUS

PDF

39.2 KB Created: 2020-09-30 14:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0fb53e42e254b7e706faeac907f70a4 SHA-1: d21886a4e44b5f199296b49154fbdffa31f81325 SHA-256: 90cb212057292bba4ea8cada41adca5bc1795d006e2e58c427bb401c2a80b714
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs aligns with common phishing or malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/strik?keyword=exerc%25C3%25ADcios+nomenclatura+de+alcoois+pdf In PDF document text
    • http://files.trilogycounselingmn.com/uploads/1/3/1/8/131856365/1485142.pdfIn PDF document text
    • http://files.keithgriffithssquash.com/uploads/1/3/0/8/130813496/2024391.pdfIn PDF document text
    • http://files.ramorean.com/uploads/1/3/1/8/131857193/fagomevuxeje.pdfIn PDF document text
    • http://files.bbjdecor.com/uploads/1/3/1/3/131382028/nilutuwudipe_fixogivo.pdfIn PDF document text
    • http://zoweniw.uniqsoundbymck.com/uploads/1/3/1/6/131637308/ginamarefopu.pdfIn PDF document text
    • http://files.havelsflowers.com/uploads/1/3/1/6/131606056/gitinazanilevisirot.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/16641171124.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/molinogosipu.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/13c41d11-ed3c-424b-940d-726800ebae10/63454683313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1404ff7-2de6-4109-b47f-d8a4d16e639d/84354239489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4274f596-46e0-4118-90e7-7d9970b070d5/59398681139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13070e24-7e9c-4e0f-8263-af5103af66ac/kidipufema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af07a0bd-328c-46e5-9218-cf8a629d2061/sukapidofilurazizipadile.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_off00005676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5676 5380 bytes
SHA-256: 53ccbb8790e97076ea9963fbf1c0d950f09a47ec769eb89d79b9e344daaa8df6
font_01_sfnt_off000068ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BA 12356 bytes
SHA-256: ecf52d6032299ad084fc1c0a6878f99b6d766e763ddcc6af349b3f939e06b948

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