Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d3a1856f76aa31…

MALICIOUS

PDF

141.5 KB Created: 2021-03-21 08:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 966fffc1490c190c76ad4566b67e8cb0 SHA-1: b058913c872650f80fe576ac470357a1b87e9345 SHA-256: 19d3a1856f76aa319eefdc4bd3d710903002a7392af6790cc3d7d95b9aa35875
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site like 'lozipotod.ru' for further compromise.

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://lozipotod.ru/award?keyword=aprenderas+a+no+llorar+pdf PDF link annotation
    • http://leaninrzpd.site/piano_concerto_no._21_mozart_sheet_musicwy1vk.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/89789422310.pdfIn PDF document text
    • http://arfesopt.com/90390860578el1q2.pdfIn PDF document text
    • http://pukogika.iblogger.org/aacvpr_ccrp_study_guide.pdfIn PDF document text
    • http://autobuff.xyz/zumem599za.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/convert_list_to_dictionary_python_enumerate.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/abide_with_me_matt_maher_chords.pdfIn PDF document text
    • http://penimagide.iblogger.org/example_of_quadratic_equation_with_answer.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/is_there_a_new_fifty_shades_darker_coming_out.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julaxel/types_of_mineral_admixtures.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/11399612771.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_37f6a12a4fbc4f49812650387fde9c6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1050f99f-428b-47ce-bca5-1bc3b5b1f033/canon_pixma_mx922_driver_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/mi_planta_de_naranja_lima_resumen_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec22ce3-0f14-4d05-8466-0aa8670bb746/america_the_essential_learning_edition_volume_1_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d000ec25-ee82-4c75-aa67-6324ccd74dba/sword_art_online_season_4_release_date.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ab582762ab124f468698c3c42b648079.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_f9794ad1ea214a73a4f0ba03abd8bdcb.pdf?index=trueIn PDF document text
    • http://ravesezubepad.epizy.com/64679774611.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_27b8ef74f83c444a89fba7748a456f47.pdf?index=trueIn PDF document text
    • http://taxivufiwe.rf.gd/3125166686.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/dumomizobagedanek.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_off0001ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED87 5024 bytes
SHA-256: 643c063adba65cd2301d5b15f19d018783b283599695f031683edead234be320
font_01_sfnt_off0001feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEAC 12532 bytes
SHA-256: 5bbebcf173a901c13cf597edf7c6635906299a9d6cc5620d429315031001ca22

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