Malicious PDF — malware analysis report

Static analysis result for SHA-256 05424e0fc7e3d16c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 05:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ae3f4f1e8337d8bb4030d4d0d4655a4 SHA-1: 8723259ec3dbeea35fa433043580a71e9ff3c743 SHA-256: 05424e0fc7e3d16c7159110fb1997fcc4b0082fcb99882d4264dbb55113833bc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, flagged by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious content as educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=addition+and+subtraction+4th+grade+worksheets PDF link annotation
    • http://tevfikyuce.xyz/14653680421hd28a.pdfIn PDF document text
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/6736284.pdfIn PDF document text
    • http://ryursew.space/hmrc_uk_tax_return_deadlineat3tb.pdfIn PDF document text
    • http://bexukitekivotap.22web.org/96928181637.pdfIn PDF document text
    • http://bestsalestoday.xyz/57429536449er4cb.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/QheUhhc/7410347526.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/ihjXaia/microsoft_sharepoint_online_status.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/cjdlMge/defender_110_pickup_cover.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/c3e0028c0dca.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/ho7jhI0/november_playstation_plus_free_games_ps4.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/2399707.pdfIn PDF document text
    • http://organize.shop/italo_calvino_short_stories_online0wzyi.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/dXEijgd/50429856658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_8b44a0f9e7894621a5a42c3c78851d84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/which_country_is_the_largest_producer_of_steel_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/white_knight_chalkboard_paint_safety_data_sheet.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/fesutud.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/34845859142.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/58414403929.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_0df43d74c1004d8697873d736c767490.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_149cc9a6e88b47ccbf2a0f30086e9787.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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5540 bytes
SHA-256: ecd105d0b28b0a4a3ee6920f0a2c02bfbc047cfe03df890ebdf272ce6db675ae
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10652 bytes
SHA-256: 0d6ace4109a8f81cb02192117f1d5f9c35e3f47bb9e507f55890b07597c9a6b2

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