Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75a8a9bcee6d98…

MALICIOUS

PDF

74.7 KB Created: 2021-04-18 09:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cb182ab2af4657b2f376d1c4bc0c8b31 SHA-1: a81294acb902e57f31b08a78570d168a250c04d3 SHA-256: 9c75a8a9bcee6d98bbdd086e9f3251d2518cecc69741ba1bea372612f245fdf8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL, 'https://gimoguvi.ru/strik?utm_term=is+warehouse+operative+a+good+job', suggesting a lure related to job searching. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://gimoguvi.ru/strik?utm_term=is+warehouse+operative+a+good+job PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5ffe899d9c42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_60171468ada38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_603e2711a577c.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/9369745602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_600073be0d656.pdfIn PDF document text
    • http://rezisugamufi.22web.org/bixuwusewigonefufatip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwutonunol.epizy.com/aliments_acidifiants_et_alcalinisants.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/best_eclipse_javascript_formatter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4366667b-1bf7-4db7-8896-ae794d95e455/tijenoxabogurutevopavigal.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/3308531072.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/gurawexesuwusotefowis.pdfIn PDF document text
    • http://xojesenokok.epizy.com/freelance_web_developer_resume_template.pdfIn PDF document text
    • http://xevupan.rf.gd/looney_tunes_theme_song_piano_sheet_music.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_67f095772c9f459dab2e10faabd7dbcb.pdf?index=trueIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_caadcea1d6ff43f4b596b2b1211c834f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/101ffabb-f38f-4ff3-831c-976a22c37cb5/bubutuni.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/13768777321.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_281cdb83b4714a03811f2f1c09b71d3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c05dbb-e5a7-420b-a5df-12035ada5107/how_do_you_balance_work_and_study.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/introduction_to_philosophy_classical_and_contemporary_readings_6th_edition_free.pdfIn PDF document text
    • http://dozirojaj.rf.gd/biology_research_paper_topics.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 5492 bytes
SHA-256: 57d21508e5ee3aba324179eddf81d8d16ca77e3bcf36f955155e6f12c8f3ae6c
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 9760 bytes
SHA-256: 0268286489b9bc51fa4ca8d7a5b48d3599d6c3aa28b949b181d50f5882b41d10

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