Malicious PDF — malware analysis report

Static analysis result for SHA-256 6311df25df599a35…

MALICIOUS

PDF

76.2 KB Created: 2021-03-08 17:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f580699acf189c7bdf21640bcb3d0af SHA-1: 48ffae0c8df04f7684fe1001896d438f1a349d75 SHA-256: 6311df25df599a35cde9438be4d48f938af978bb870e7acb652c5a8c05052fc2
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/123?utm_term=sketchy+bongo+songs+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fec8b711d35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_6038040ae3268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_60446af48f90e.pdfIn PDF document text
    • http://kufigada.22web.org/15081751616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fd662307104c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6025c626aabe1.pdfIn PDF document text
    • http://danivufulof.iblogger.org/pidijopedifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c60c0d64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_5fd8dcb6a5a57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zarixisulepu.rf.gd/1-99_crafting_guide_rs3_2020.pdfIn PDF document text
    • http://zuvubisenegazi.epizy.com/49055499681.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_b5343a38419747bcbac65fba7a884074.pdf?index=trueIn PDF document text
    • http://lamujep.rf.gd/imam_bukhari_biography.pdfIn PDF document text
    • http://fajesunuk.rf.gd/mirazupolizen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c06ffd0-287e-4712-b8bc-ed8d8779ab69/standing_warm_up_exercises_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d828a8e-b054-4971-8952-cab29aaba9ed/84652258453.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_612f1c21f4cc4008916108576d3db2fd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 5052 bytes
SHA-256: 3f5144b4c2906c4824cd00c19593fd5f53aeeb814d4bc5258442b5d60e5b7a76
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 12356 bytes
SHA-256: fd1eb87e0ec5c1cb9609310cf234595382897e1d8f49dba33c47572ba4297425
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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