Malicious PDF — malware analysis report

Static analysis result for SHA-256 713f453dbd441ea0…

MALICIOUS

PDF

76.3 KB Created: 2021-04-24 11:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55d71df3267c885472be7b0530adcc00 SHA-1: 6e91b9f812af2f93660c17db42dcfec368a179ad SHA-256: 713f453dbd441ea04a652f060f0dd4e77ff92fa79323fe747f710a638573ce16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+the+bible+says+about+fire
    • https://cdn.sqhk.co/risenulowo/ibiqfii/68779185063.pdf
    • http://webdefilmizle.com/zebidepou9or5.pdf
    • https://cdn.sqhk.co/zasokolof/iaOhehc/54008475029.pdf
    • https://cdn-cms.f-static.net/uploads/4402014/normal_602e508320c9f.pdf
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/7050610.pdf
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6027962e486ee.pdf
    • http://medyahanem.com/dirt_bike_racing_unblocked_gameste77c.pdf
    • http://dresdenpharma.ru/sdlc_software_development_life_cycle_processesttzpn.pdf
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/bopuvubifinu_ritesut_nekigomu.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/xexetejure.pdf
    • http://birjand.design/33772586299lwogm.pdf
    • https://cdn.sqhk.co/vimerokil/zgifiis/maximum_size_for_carry_on_baggage_alaska_airlines.pdf
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/1500e4be861519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_1ca2c04571b34dfba6671e3c439b44d2.pdf?index=true
    • https://s3.amazonaws.com/gimisorixosu/sogek.pdf
    • https://s3.amazonaws.com/bomifabipi/31279573431.pdf
    • https://s3.amazonaws.com/muwomapotumugi/agneepath_2012_poem_video.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_85841efee36449ac907b6a44ed9055e0.pdf?index=true
    • https://974ccb66-d31d-47c3-b588-12ee91811e6e.filesusr.com/ugd/205ae4_34b3abc316c840589840fa75796543b7.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_cc3c17912cae45a79adeb1b922e4c05c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin
e1a88c6264d29b4d8082f7034fe2d33944ba3718da826161af17c88f52a05371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5112 bytes
font_01_sfnt_off0000fe97.bin
975a6314a8d3bb0a817e25a36f35584bcf062fdf97fe949ab0719fb74f1ddaf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 11012 bytes

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