Malicious PDF — malware analysis report

Static analysis result for SHA-256 375975ed45856828…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 05:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 93cffeaac68c7f962af97adc740d8680 SHA-1: 0c1ff3107e40e9e7796e89d1da5b2aeaa88e7ab8 SHA-256: 375975ed45856828d94b2e94a4a8c5bff74b15457bdbced426fed80f03b99809
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure and the overall structure suggest an attempt to trick the user into visiting a malicious site, likely for phishing or to download a secondary payload.

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
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=uk+resuscitation+guidelines+2020+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fcdb3a449403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fe5db0c15051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_6029d21f1ec35.pdfIn PDF document text
    • https://ruwevupezo.weebly.com/uploads/1/3/4/0/134013147/toraxapolis_dodefebe.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/27877913371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465131/normal_5fee4dc1ee0e6.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_to_clean_rainsoft_water_system.pdfIn PDF document text
    • http://jopimutedu.iblogger.org/29015648885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_60313dc5296ee.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/zuxijasagikepuzezimazufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5fdb250eaa0d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fc9cc42dbecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_6026567b0f083.pdfIn PDF document text
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/3301460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebupeb.rf.gd/tabaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/housing_affordability_crisis_report.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/bajokakitad.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/favunilumetoru.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/nenigatexer.pdfIn PDF document text
    • http://tosurok.myartsonline.com/93881254517.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/25024783627.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/rezikarewofinevugunuw.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_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 5652 bytes
SHA-256: 3445869247495c592bb8294de9e6782ad6f4d4511f44e60bd2fa6840a887d976
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 10504 bytes
SHA-256: f09b723f0283e3cbfc925cb17a3d6c86c8a897030cf33c84b2e4c762faa14ea8

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