Malicious PDF — malware analysis report

Static analysis result for SHA-256 665899478c7eb497…

MALICIOUS

PDF

41.2 KB Created: 2020-10-24 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 256ddb2985ec273eb8070dd5c577e40f SHA-1: 3995ad14932030129e1beee0877a018ade1c695c SHA-256: 665899478c7eb497050a656224abb483489caa11de616dead5ad97e9c7f764f3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for further exploitation or phishing.

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 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.
  • 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://ggtraff.ru/strik?keyword=augustus+john+williams+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f8be74a02546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f89b82bee6bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f923f5e5f8a5.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/xalurafopetiwemozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f8888352dcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f88cb8356905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8fa8a9edfd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8b6896be44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f874eb401dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f913fbf4c48b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5f93a741802bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f8b5b521e64d.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/5072e1d9-6ee5-4e85-8467-0521dfbffe15/puxetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eaf0fc4-6891-45bc-8eb3-c32f3641557c/temps_et_volution_chimique_cintique_et_catalyse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40fc2a8-0020-419e-ad62-58129f847ded/interrogative_pronoun_worksheets_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b94d497-46dd-4bb5-b5cf-42953097a195/8496806646.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/12749452925.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/anesthesia_instruments.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_off00005fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDD 5516 bytes
SHA-256: 0c761c6cd9b9d2c221088b52b02aaa78b5987eb300800aac7c8ea7557b7a4d9d
font_01_sfnt_off00007299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7299 11080 bytes
SHA-256: 075589d1d761e98e17414fd4e304d2763b4680d74db2d75c68f550f3bdab7d20

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