Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98c54dcce4f470a…

MALICIOUS

PDF

70.5 KB Created: 2021-03-07 02:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73fb10fbcb19c8ee77838531abacbfe0 SHA-1: a914d996cb8f21ed80ba2fd0ccbac5cf271c17b9 SHA-256: f98c54dcce4f470a010225bd2e2c07785d47e1d225190d80b8e1688b1c00ed40
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect users to a malicious site. The document body, though heavily obfuscated, contains text related to 'mental health assessment' and is associated with link farm heuristics, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=how+to+prepare+for+a+mental+health+assessment PDF link annotation
    • http://rosativiwam.mypressonline.com/1978_mercury_9.8_weight.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/ingenuity_bouncer_manual.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/citizen_eco_drive_world_time_how_to_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_603973be508bb.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/hey_whipple_squeeze_this_summary.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/diversity_equity_and_inclusion_discussion_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6584fe3cef.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/vampire_diaries_season_1_episode_3_watch_online_123movies.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/luvumipigegug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_60265408ecf5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/53192052817.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/takufolovobiviwogopira.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_23ba03fa6ac141c093f45fa6cd369efb.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_6a57e44553cb49f19c96412c6ec005b0.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_1a2b2aced9094203bde30f9eecc90f60.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_c6a92b28235341d9acf76b5fd635ef82.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/international_marketing_in_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/58193837089.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/5800007536.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_b37b60a81e344e0880aee7aeb4294346.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/sinizozajanixowuzobi.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/34700464472.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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 5192 bytes
SHA-256: 67ef2030898e0e83efa9f8efb232161382dfa30e92da9c8a8e8c9da39dbd49b0
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 9948 bytes
SHA-256: e9299deb74dcbbd92251016c78e7db8d814e756992e855f5f40d3ce2b493b8bb

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