Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad932dbd89a434c…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 21:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be65fc703472062b6504307a42c0f793 SHA-1: 8938db750f8bc944cc0f569e22a121dd972e295a SHA-256: bad932dbd89a434cf38556a4fd07c04565331de9d9f70fc4636adedf7cee9dde
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'self confidence definition psychology pdf' and is associated with numerous external URLs, suggesting a lure to trick users into visiting potentially malicious sites. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

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://jumiwimov.ru/award?keyword=self+confidence+definition+psychology+pdf PDF link annotation
    • http://goldotzyv.ru/everstart_jump_starter_750_owners_manual24u24.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/e9ee9089e.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/telugu_calendar_2020_download.pdfIn PDF document text
    • http://antonio-ita.space/6526116107gln66.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/sobafesakapiro.pdfIn PDF document text
    • http://dezozuxuwok.iblogger.org/free_comic_book_files.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/23968992924.pdfIn PDF document text
    • http://ecoservice-vlad.ru/just_jumble_answers_10426u2e3.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/nirejema-degijuw.pdfIn PDF document text
    • http://kozovuxe.22web.org/badri_kannada_movie_all_songs.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/apache_kafka_1._0_cookbook.pdfIn PDF document text
    • http://fortuneo.biz/they_say_i_say_4th_edition_free_download51yeu.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/6519014.pdfIn PDF document text
    • http://topfrag.rip/baidu_maps_app_android45hw6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodisasedozax.myartsonline.com/zuxopugokifobizin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192c4e24-d907-4214-808c-fa35d288a0f9/5259280210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b5bdf2-3144-4b56-a64d-f0ff6db44baa/star_wars_ahsoka_book_2.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5316 bytes
SHA-256: be788b1114d7155cb9c55a86d8ce4fa92da0cc699260b5e8637dfddbfb8ea223
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10900 bytes
SHA-256: 035f333bb6bc232eed68029cc3cab56d06eeabc652c50748ae9a5bc6c8d17a8b

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