Malicious PDF — malware analysis report

Static analysis result for SHA-256 5250f8dbbbb7e98d…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 07:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 327d6823bbe8446aacd25f4b7f7964d2 SHA-1: 45ecd79bec54afacefd442d27ed079b4bde5fe9c SHA-256: 5250f8dbbbb7e98d0290047a2ff732501677400288d4fc09612f5ce524df9509
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with one prominent link pointing to zajinet.ru. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest this document is intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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/award?keyword=gejala+penyakit+jantung+koroner+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6030432abd36c.pdfIn PDF document text
    • http://soldatskaya6.ru/piviwe6onv.pdfIn PDF document text
    • http://100naturals.fun/pokisaxevivekade5huxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481420/normal_5fecbcba4730a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_18d138891681462c850da8ed3d43d797.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/jorewowuxavofunugefev.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/ferezune.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/92131488746.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/dovalofilolapajisoleru.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/what_is_reflection_coefficient_measurement.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/rakanugedovofidu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/bar_bar_din_ye_aaye_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/autocad_architecture_2015_tutorial_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/honeywell_thermostat_rth230b_ac_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/thompson_history_of_south_africa.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_a8624b08b323485e9f4f8a71918afe06.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_632e5b30d1a3425a97acb7d83007d451.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_18e037234f214bd78f38629c5af5b5f2.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5304 bytes
SHA-256: a18b463addf97e7604bec94bae2bc20262a31c1a300bf38546b6204dab375574
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 9944 bytes
SHA-256: 4507738211046915acb4b1062861a83372ea96a6e96a46fb6267597e53e69203

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