Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e8a668b0559120…

MALICIOUS

PDF

72.4 KB Created: 2021-02-11 11:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 485acb658b7c18fc64f8e29802e5d4a8 SHA-1: 1eb817d1e11171e5ae1480f5ea25fd39d8591b11 SHA-256: e1e8a668b0559120eb1a260d615b5387f5bdd189fe88b163dafd3da51f979e1f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=a+very+old+man+with+enormous+wings+analysis+essay'. Additionally, ML classification and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=a+very+old+man+with+enormous+wings+analysis+essay In PDF document text
    • http://yognat.space/figurative_language_worksheetygsgq.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/JvZhgFi/latest_ringtone_2020mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/hjhTage/mivubudodizixufitonodi.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jeigwhg/amazon_assistant_loschen_safari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_601a385ca5f44.pdfIn PDF document text
    • http://begemotiks.fun/819030729955yst.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/hf9SE3H/hexagon_number_puzzle_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_600f29d547a98.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/gceFBhd/69898075326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fdeea0ca9d52.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/hifjeU5/61032967719.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/Viaibic/dokunumofesitowufa.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/jijdibi/sufuwiwulutoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5fc63aedd031a.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/dofufiri/grade_2_english_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/illustrator_change_template_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/declaration_of_conformity_medical_devices_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/princeton_review_cracking_the_new_sat.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/43671846326.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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 5480 bytes
SHA-256: b1065563d3b0017ad44b922e8b486599874a8c49815796d0a1dffee5ff78697f
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 9880 bytes
SHA-256: 17578724aee7c56da48eedd347482e078b191b1935bccf66a879daa30bd5de01

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