Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d39c233052c418…

MALICIOUS

PDF

73.5 KB Created: 2021-03-17 20:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0644ab25f1850e4dc729ce734b48444a SHA-1: b71b360d1eea293d54ec433421df95d3c800eda2 SHA-256: 68d39c233052c41874dc7ca4a2d4c8fbcb612144e351a1206c862230829d47d6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'midufefew.ru', which is identified as a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of many external URIs strongly suggests the document's purpose is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=dry+curd+cottage+cheese+brands PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446500/normal_600bf5df8c51c.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/fomuvejatanudose.pdfIn PDF document text
    • http://domavera.ru/how_to_form_austria_hungary_hoi404qv9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fdb82bbf3264.pdfIn PDF document text
    • http://romeita.fun/xolakimirivcsku8.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/sutujuzobo-pojeveropodaz-kuzinulaxe-jifex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_6008caf9541e8.pdfIn PDF document text
    • http://lavkavkusa.store/cookie_clicker_guide_2017b83jb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fe0ef4e5bd63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd82baa9da81.pdfIn PDF document text
    • http://fabermanufacture.ru/review_novel_a_court_of_thorns_and_rosesg1a4y.pdfIn PDF document text
    • http://gnoogle.site/3181616728dsicp.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/642fc1fc-90f3-4946-8554-648ff5a746a3/baby_goat_birthday_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/labitux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506b15bf-9f6d-4a8f-af60-12140641c877/litejawemifukuwijaraxabu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/teflaro_package_insert.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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5408 bytes
SHA-256: 4320b9da508ca06303bf444309c9e99fd0368afff67e8b0d6499d2f64fe1ec89
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10232 bytes
SHA-256: 9fa2f0d1cf79a7c02978e4de99b52a99b07edc571213a2863482f5ae51f14148

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