Malicious PDF — malware analysis report

Static analysis result for SHA-256 03613bb9e938f45e…

MALICIOUS

PDF

34.4 KB Created: 2020-10-01 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 216d2cda11ca6c7a467f3d110ccb1e55 SHA-1: ed156deaaa458c3e056682c19e4a6f7defbc9b04 SHA-256: 03613bb9e938f45e37018e0103ed436b0574442359fb3d02fc56b6643d5f5785
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, which is a common tactic for distributing malware or phishing content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the primary redirector URL, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains the primary redirector URL and other links, suggesting a lure to download further malicious content.

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=the+babylonian+talmud+pdf+free+download In PDF document text
    • http://files.myfavoriteoldies.com/uploads/1/3/0/7/130775199/6789099.pdfIn PDF document text
    • http://kejuk.tiftcountysoccer.com/uploads/1/3/1/3/131380591/vowawavabipowe.pdfIn PDF document text
    • http://files.madxllc.com/uploads/1/3/1/4/131408340/149070.pdfIn PDF document text
    • http://valoluzat.northwestembroidery.net/uploads/1/3/1/8/131856222/51f19.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/paxuvub.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/riruzumowawur.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/98817087919.pdfIn PDF document text
    • https://site-1036694.mozfiles.com/files/1036694/fudeti.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/dogikaribolakemuzex.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/e2817bc0-5ce8-4825-8079-246d6fd29255/pukobara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51a3346-34b0-44a8-ab18-074c6a2cd949/gawavukunubodugulewuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7048c19-3ff6-4f36-9347-1b8290db76a7/54313735516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b2363c-b92b-49b1-ab15-7f384d73ebc2/nobajolusuvurisusetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d353090e-1190-4f80-a2e1-32111fd79740/vapafeniroxigabazode.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_off000047cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CB 5384 bytes
SHA-256: 22911aa56cdd41589e1ad214a509ba3f24481cefa91a05cf6547f6d12b63d011
font_01_sfnt_off00005a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A02 10116 bytes
SHA-256: 8018b872509f0312bdaddd4daaeda8bb475e1aa2d822b96e4d6d4c25551bd7f3

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