Malicious PDF — malware analysis report

Static analysis result for SHA-256 3412ce306cb866e7…

MALICIOUS

PDF

91.6 KB Created: 2021-03-22 23:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 958b47f648bf15fc3dca301eb57040cb SHA-1: fd23b8f756baec19ae6f47d39abc09aa07540437 SHA-256: 3412ce306cb866e7d1cb4c82a8a4559573b365ca65c527d514233c0058f173ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The primary external URL observed is https://soxebez.ru/strik?utm_term=wall+street+journal+index+funds, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=wall+street+journal+index+funds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5fe197494ea70.pdfIn PDF document text
    • http://apeech.ru/sideriwilaxaluwadk7jv9.pdfIn PDF document text
    • https://kitijudaxedefex.weebly.com/uploads/1/3/5/3/135350735/mefap.pdfIn PDF document text
    • http://x-bionic.shop/800611651064xjyc.pdfIn PDF document text
    • https://zupakikaxabu.weebly.com/uploads/1/3/1/3/131380404/vutufit.pdfIn PDF document text
    • http://dress-russia.ru/rikevetifijdj38i.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/sebuv.pdfIn PDF document text
    • https://xizuxukavawot.weebly.com/uploads/1/3/4/3/134376570/julokujaxarep-bividipokole-tiwiba-mogebukutelij.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/kovupamogulawoj.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/7e2b8d2986.pdfIn PDF document text
    • https://dodewugorar.weebly.com/uploads/1/3/4/6/134686454/5983275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_6046f491786a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_6fa76afbcad6402b94ed5737075cf7f2.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_4c7c18aedf6543b0987e067add71f29c.pdf?index=trueIn PDF document text
    • http://suwuriru.onlinewebshop.net/65628519447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b1116e-5c48-4391-9940-e0948ff354ae/89066748651.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_bec4c49ea7014081b5d9896def24b567.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_edf2432ecd9345738eaa18791d9dbf65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e274fa7c-07c0-4376-81d9-0480e72c617f/jixirawoximubebupasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0dca36-4ec0-4a47-b9e7-47f6546a0963/time_is_ticking_or_clock_is_ticking.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_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 5060 bytes
SHA-256: 57422ce62ec800698df4a7e53e64fac4ffffad7a9380a040eeeb8886bcd82738
font_01_sfnt_off00013949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13949 11664 bytes
SHA-256: c39705376d9ea6b9da2830d187e17ad88ec0f880ec0fb38ee5c627c270bc6150

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