Malicious PDF — malware analysis report

Static analysis result for SHA-256 862c8fbafd9e8a1e…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 13:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5a1d78b9247b3d7f2f9efed4b45600f SHA-1: 0615a14b34f02390fd9520449f435476a4da0d9f SHA-256: 862c8fbafd9e8a1e0f23a08d1cf70d7dca9746c77eb5894dab2630cf3b8d119c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded URLs, one of which points to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to product search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=apc+es+550g+battery PDF link annotation
    • https://gaxuzuwe.weebly.com/uploads/1/3/1/8/131871814/5940498.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/wokuku.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/ohhicjg/wirinoberebejubuwuseki.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/6155207.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gdpc45M/90181958776.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/jixetixudot.pdfIn PDF document text
    • https://numemepo.weebly.com/uploads/1/3/0/9/130969514/gupemegebupibosezobe.pdfIn PDF document text
    • https://cdn.sqhk.co/tijaxasazuwi/ibu45FZ/78066955635.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/tomorrow_when_the_war_began_cast_tv.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
    • http://zesodowiponuse.epizy.com/xebunedazorusutibeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/balupu_telugu_movie_in_utorrent.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/general_quiz_competition_questions_and_answers.pdfIn PDF document text
    • http://kajilurugo.rf.gd/letter_tracing_for_toddlers.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/garmin_gps_76_user_manual.pdfIn PDF document text
    • http://gogulet.rf.gd/donobisib.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/nelson_grade_4_math_workbook.pdfIn PDF document text
    • http://titegerekarirov.rf.gd/macbeth_study_guide.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_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 5088 bytes
SHA-256: dd55a933cceb1d305f4c59eea0fb7a48fbbd252948e1e329c2027e38e6423486
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 11580 bytes
SHA-256: b29f39e74047b5afeb2bd1c67288dbbea47a6e3cd6592112854091ae0c33ef56
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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