Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd6f39c6096086…

MALICIOUS

PDF

71.0 KB Created: 2021-02-09 17:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: af12e079aba2d15d0738d6f008dc7f42 SHA-1: 72ccc712dcfb5b1fbbc6fe09262d73d0b768a956 SHA-256: 26bd6f39c6096086d3e8e3552f6392577ec0f3502a0ef87bea10f50655a5bbcf
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'Diverticulitis nhs diet sheet', which is likely a pretext to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/aws?utm_term=diverticulitis+nhs+diet+sheet PDF link annotation
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/mesunu-biwulakesamukud-sotilusonaliwor.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/bts_fake_love_sheet_musicuoeji.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/inventors_and_their_inventions_worksheets8mar5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6007a63335ca9.pdfIn PDF document text
    • http://megahit.space/bajirao_mastani_hd_movie_1080p7wu52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_60171955e2096.pdfIn PDF document text
    • http://douchelabs.xyz/michael_jackson_flac26pni.pdfIn PDF document text
    • http://fastpysystem.online/97094272617hktey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_602165d45fd4e.pdfIn PDF document text
    • http://segwaywheelchair.ru/turbo_assembler_c64_manualqy13n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446651/normal_5fcb123edb4b5.pdfIn PDF document text
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/7053545.pdfIn PDF document text
    • http://instapriz365.online/mujiforiruldkx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/xogixok.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/example_of_business_report_cover_page.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/simura.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/kumon_math_answers_level_d.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/nufekaxevarepazekakuzu.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 4876 bytes
SHA-256: 0bbf0897500b5d43f6b2181be1dfd9b75809829627992d3e2bbf996481ba0af7
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 9904 bytes
SHA-256: 0a93c85d12e9912ab36a7dcaefb4577ea61467ae29690752992e5d9659c3654a

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