Malicious PDF — malware analysis report

Static analysis result for SHA-256 902ab6cddb105051…

MALICIOUS

PDF

81.4 KB Created: 2021-03-20 19:38:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a2a58d80ede543a7acb26d482d565781 SHA-1: 0f9186e9fb6aa693dbc4c53e8011becad45fcee0 SHA-256: 902ab6cddb1050517c342fb42ff3ca6fe2c0008c9e39d24c22108946a6aadafc
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The primary external URI points to a URL that mimics a search query for 'Immigration letter of recommendation from pastor', indicating a lure to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/wix?keyword=immigration+letter+of+recommendation+from+pastor PDF link annotation
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/49535c.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/Sji8BHa/18_awg_power_cord_current_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/hc0tdHA/jifatug.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/7921a78b6b3.pdfIn PDF document text
    • https://rutebesutev.weebly.com/uploads/1/3/4/1/134131531/zawefaxopo.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/20749271295.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/HhKxFhd/672694821.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/biiaohj/wovurutogumegifuvogimug.pdfIn PDF document text
    • https://sixoribena.weebly.com/uploads/1/3/4/8/134848884/nilab.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/GivWidb/ready_made_projects_for_electronics_and_communication.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jakujakula/fishing_guides_lake_eufaula_oklahoma.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_d49c76b4c8ae4351bb3cb84dd8fdb673.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_0e885c5604644f3b87efa31ac954fb09.pdf?index=trueIn PDF document text
    • http://wujagenak.atwebpages.com/whistleblower_ukraine_complaint.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/34017976622.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/6487637573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75649e8e-c5cc-446a-888b-ebcb43e9692d/hoover_windtunnel_belt_replacement_38528.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_336cf13b7b624fb0b8837ea284a3e7a2.pdf?index=trueIn PDF document text
    • http://lavapokapajemob.myartsonline.com/present_tense_worksheets_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/bestway_cement_annual_report_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/how_long_ago_was_the_bible_book_of_job_written.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/demajuranugo.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_44387315369c435babde37d5a8fba642.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3360a2e-a866-4ab1-b449-611acaa633f4/avalon_newport_bay_pellet_stove_insert.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5200 bytes
SHA-256: f40476f8a8b7e6f6bd5173efe190ecef079b8861d47eecde0e433b4db3e95eab
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10556 bytes
SHA-256: 619d7cbb6098d09a1ee6927911969867340e317e3e85cc489072e51242199c05
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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