Malicious PDF — malware analysis report

Static analysis result for SHA-256 862768fe1ffca8ea…

MALICIOUS

PDF

76.2 KB Created: 2021-04-16 07:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ca57cb85da7a5bb09251c3d951de7704 SHA-1: 91c96f94817c88c3a7dab587789222fa7aeb70eb SHA-256: 862768fe1ffca8ead9d3fda6130831f3dced31fbb6d46c7f7b388ffa467b7d80
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic indicating a link farm strongly suggest this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=neil+gaiman+norse+mythology+audiobook+chapters PDF link annotation
    • http://dufigep.scienceontheweb.net/52625050114.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/samsung_aa59-0066a_remote_codes.pdfIn PDF document text
    • http://mainsale.pro/jorasofujubabexetug0nebe.pdfIn PDF document text
    • http://wrestling-mma.com/21643994251cov2i.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/613022.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/juwapotadoxovoxo.pdfIn PDF document text
    • http://how2clever.com/sekorekoberenapam6jc93.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/what_is_an_anti_inflammatory_diet_for_dogs.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/retuvi.pdfIn PDF document text
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/1954202.pdfIn PDF document text
    • http://msertis.xyz/kenneth_cole_new_york_watch_battery_replacementxqt41.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/how_do_i_edit_existing_text_in_paint.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/fasuzekorobepugij.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/girl_with_the_dragon_tattoo_2_cast.pdfIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_4f5e270962334a26a499590287f111c1.pdf?index=trueIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/37680715422.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/video_maker_for_pc_32_bit.pdfIn PDF document text
    • http://megugasawixige.onlinewebshop.net/43807438107.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/gisusokonofaruzusel.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_160cc19ecafb4d0d8b491e4d61527ffa.pdf?index=trueIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_cee5daf01c8f444ebfdf9ce86293210c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/what_oil_to_use_for_diesel_generator.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_9ebee6cb933f46438578973398ebd8af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/bupapo.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_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5760 bytes
SHA-256: f50e8bbfc04e632db1cec9bda5fcd8929d6a029dccb9203a871f040094acc62d
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 11168 bytes
SHA-256: eb72aeb10dfdf2cadc3670c728ae84ae53c900c597246d6b3f6f6a1c1c5f4336

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