Malicious PDF — malware analysis report

Static analysis result for SHA-256 9834352ed1f9d3b1…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 21:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb66742051f69071268fb0f95df73233 SHA-1: 250d3d9f1d36cd325e8d322775d9161cba241240 SHA-256: 9834352ed1f9d3b1c92afddb5f873376451249ef93e225ec99b76e6f08851997
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to a 'game show killer documentary' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=the+game+show+killer+documentary
    • http://moxupasasitote.mywebcommunity.org/jivitukuneravom.pdf
    • https://cdn.sqhk.co/jitegoji/hhfhfZk/can_i_learn_to_dance_at_home.pdf
    • http://radogomi.mygamesonline.org/free_download_math_worksheets_for_grade_5.pdf
    • https://cdn.sqhk.co/mutexeze/njehh4Y/54803750863.pdf
    • http://koparikamoze.scienceontheweb.net/tijiferanu.pdf
    • https://cdn.sqhk.co/bunigenozav/Djjiage/kumejudunevadakekorejuzij.pdf
    • https://cdn.sqhk.co/zubavagi/T7l2ibW/crunchyroll_down_detector.pdf
    • https://cdn.sqhk.co/libudezetuv/eAjDPHT/best_photo_transfer_ios_app.pdf
    • http://nogurufegu.mygamesonline.org/electrical_estimation_and_costing_book.pdf
    • https://cdn.sqhk.co/rozopebak/gcgcNjc/dna_strawberry_extraction_lab_answers.pdf
    • https://cdn.sqhk.co/kululojilo/6m5gjii/rocket_league_change_music_in_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a99dfbbb-fb44-45bb-a4d5-096775bc8f68/what_is_a_6_month_tenancy_agreement.pdf
    • https://uploads.strikinglycdn.com/files/ebd5b784-c984-4f48-8781-1776f30e44a8/31736145831.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_8e89ad3bee5b4e0180dd34a8d8b5c490.pdf?index=true
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_60efb90cddd84471a0dbacd35e210a9f.pdf?index=true
    • https://s3.amazonaws.com/gedesisumi/home_credit_vietnam_annual_report.pdf
    • http://bexovivuvere.myartsonline.com/samubujelawunoriti.pdf
    • https://uploads.strikinglycdn.com/files/5602460c-6d48-4487-a1f4-5a4ca544b3e2/download_twilight_full_movie_in_hindi_480p.pdf
    • https://s3.amazonaws.com/xomudufe/bomiru.pdf
    • https://s3.amazonaws.com/lixuzo/2648201326.pdf
    • https://uploads.strikinglycdn.com/files/10a089f9-1fa9-4800-9e86-f75a832b9790/watch_marvel_movies_in_order_on_disney_plus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f623.bin
cbd0b7e4bd979231e95899f8a0025332e005aa2df83abe446f3fa17d873bd135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 5560 bytes
font_01_sfnt_off000108f9.bin
dbc636f0c4c4ee94611633e2887d703a78332976b1e33f7ae7eecb8549009ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 11544 bytes

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