Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7f7d2958ea42d8…

MALICIOUS

PDF

73.0 KB Created: 2021-03-15 05:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 08e853d584d513a9f81c92fa6437ceb0 SHA-1: 947efb83b867dc5880b488ad62af49792b16988d SHA-256: aa7f7d2958ea42d86a318bf535c94cefc649b83efd8320473dbdd6a78daf281a
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that redirect to various disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search query, indicating it's likely a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=audio+amplifier+circuits+pdf PDF link annotation
    • http://natlegend.space/lowugiruus9z8.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/76625555573.pdfIn PDF document text
    • http://douchehub.xyz/xobinemaxevoxixf3fy0.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/master_and_commander_the_far_side_of_the_world_music_from_the_motion_picture.pdfIn PDF document text
    • http://idealica-columbia.site/cystic_fibrosis_foundation_patient_registry_reportyg8xr.pdfIn PDF document text
    • http://5dradio.ru/dafasu3fvpt.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/48413785217.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/how_hard_is_swat_training.pdfIn PDF document text
    • http://logoped-samara.ru/excel_print_to_landscapeo7t2k.pdfIn PDF document text
    • http://joblanc.xyz/what_is_the_role_of_administrative_lawaa0z3.pdfIn PDF document text
    • http://usesalle.xyz/formato_nacional_de_busqueda_de_personas_desaparecidas45ukq.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/appsc_group_1_syllabus_2020.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/disop.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/auxiliary_verbs_list.pdfIn PDF document text
    • http://scarcebook.com/xitedokm7t5.pdfIn PDF document text
    • http://apeech.ru/99775007616qvey4.pdfIn PDF document text
    • http://thefortykuti.com/56273843454xj5vv.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/how_much_does_a_real_estate_education_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5288 bytes
SHA-256: b23c17e7bcbc9133cb0db80ec15419f8e196f83ce7668ab0f86c85d63f2c9c72
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10896 bytes
SHA-256: 96362864cad15b57f2ddf85a9b95e6bbfe7291e2404547901e129c09ca732212

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