Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd214539f76c441…

MALICIOUS

PDF

79.4 KB Created: 2021-03-05 03:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e195a7ea8618d7b909c08ef470e4a0c SHA-1: 8ec9046718d6a9472abc474182eb7ef8c061cc7a SHA-256: abd214539f76c4411581c6e02eefff694272457ee1ea1054cc02c2a6beaa516a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a critical ClamAV detection and ML classifier flagging it as malicious and phishing-related. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and one of the primary external URIs points to 'crophysi.ru'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=calvin+and+hobbes+snowmen+comic+strips PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fd7d9b40514d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60379cd765d2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5ff2d545c60be.pdfIn PDF document text
    • http://xojudesabesone.66ghz.com/93840270873.pdfIn PDF document text
    • http://iciko.xyz/find_attached_the_filled_out_form92339.pdfIn PDF document text
    • http://lexaliki.22web.org/92895590982.pdfIn PDF document text
    • http://emirofficialzm.com/homelite_2700_psi_pressure_washer_pump_oil_changey5n71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5fe45073c2724.pdfIn PDF document text
    • http://znalomstvavip.site/70919177756esicf.pdfIn PDF document text
    • http://magic-world.site/jawikikjzm3f.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/607f53f9-b78f-4342-96be-3454d32af211/is_there_going_to_be_a_5th_diary_of_a_wimpy_kid_movie.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_5dd0c0ab68c941a598922a0e2991995e.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_ad00f2f6804943ccb1ff5687c1b4812e.pdf?index=trueIn PDF document text
    • http://sowabufiki.rf.gd/nenilujefetew.pdfIn PDF document text
    • http://ligexaxo.epizy.com/finders_keepers_consignment_boutique.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_2418aa423f944c3c9ab77e8552e72115.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_618f3053618c4ff589f4bc49be8c06a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de38fb8c-a88d-4d16-953d-7944eac4bdf9/dazejopulararikujax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7241be0-293b-41eb-b442-4fe537c193ae/zorojuk.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_0304020a429f401fb8ad6ac79c4e7d47.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_f95649a01021445585c06f951ab9e009.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5508 bytes
SHA-256: 33179d1b4b10fb0eaf88f97d5148e9f1fbd006a17fd15100e216f5426e0ed9c3
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10448 bytes
SHA-256: 4c16f60d45eec4bf3758a593fe1258611168ef9fc58df8b0ec5007df7d1d0f42

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