Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4254134ea39812c…

MALICIOUS

PDF

83.7 KB Created: 2021-03-08 14:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 625a8e26afa0b49ed70672316a08ff3f SHA-1: d0d6cf557669406ed255d03efbb593da2b5ee2a0 SHA-256: b4254134ea39812c7af0e1bf868d46853387a501567d6c7fa95506ac9f7101a6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=chemistry+quantum+mechanics+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fc7d34566af5.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/what_sizes_does_dunkin_donuts_have.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/zirubotowupupajafasixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fd7780e82d33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fcb7956b81a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_60418094c6201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5ff13487ae2d7.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/a67d98ad-c046-4e78-8f49-c30f87b4bc2e/60712437302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786324dc-7ecd-43a1-8a85-8cdd688ba280/the_shack_book_quotes_with_page_numbers.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_fa50610a036c436a99f64399b39d98c3.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_b5f6720911834b489f929e7989ad96ce.pdf?index=trueIn PDF document text
    • http://pusupap.rf.gd/consumer_reports_safest_cars_2015.pdfIn PDF document text
    • http://konemuga.epizy.com/psalm_23_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741e888a-7393-41b6-b7c8-8e7095eff975/regression_modeling_strategies_with_applications_to_linear_models_logistic_regression_and_survival.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/lukerege.pdfIn PDF document text
    • http://xuduxabizova.epizy.com/2013_honda_civic_maintenance_reset.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_9acd063ed61248f8aee4797e6b4be469.pdf?index=trueIn PDF document text
    • http://zulonojaminipe.rf.gd/dedazowanofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b56114a-cb2f-491e-a5eb-ef56b16746d8/rirafejotebazutujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128e0a6e-c4d8-4b71-b3bc-516b42414039/47646625602.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_38d4e42c620f4b059af785c2af6a0c0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c38224-4634-4caf-9440-f520952dac38/8020550106.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_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 5296 bytes
SHA-256: da55cd168d147b33f831f552cab1d24c60ea8a22a9b13f85c514e5e76af90940
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16512 bytes
SHA-256: 37c7de9fb2e17ed2ad06d3532c16d86d5e1a9c3719e41443cd7c4ef7113d8b79