Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e59b506e88a5b0…

MALICIOUS

PDF

92.0 KB Created: 2021-02-26 06:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ee482eeceab3d99d3af0061a181c24c0 SHA-1: 566d440c61360e43fcf26f94bbf06f146cf571f6 SHA-256: c4e59b506e88a5b0d0375d58f6a90d95b05d17f174301ff62b0b964af4519e9e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/aws?utm_term=hp+officejet+pro+8600+plus+replacement+parts PDF link annotation
    • http://idealicaitalia-ufficiale.site/you_learn_by_livinghdcw2.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ajb5UvO/ac_odyssey_atlantis_dlc_gameplay.pdfIn PDF document text
    • http://kernig.online/beresheet_spacecraft_trackerlch05.pdfIn PDF document text
    • http://creditreportfast.info/208774930225xo45.pdfIn PDF document text
    • http://robinmani.site/aligarh_hd_movie_filmywapfpsln.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/ug3jhgd/18279768554.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofelagi/Yjbjejd/70272028398.pdfIn PDF document text
    • http://instapriz24.site/41316107894f1fus.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/how_to_draw_animated_characters_on_computer.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/63312858795.pdfIn PDF document text
    • http://vadukut.iblogger.org/apc_smart_ups_2200_manual.pdfIn PDF document text
    • http://cosmosqrab.online/migaj6zvpa.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/64936532129.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/cu5jjjf/colem_deluxe_complete_colecovision_emulator.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/hdTjgjc/fedodo.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/fake_xbox_live_codes_that_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/83732246380.pdfIn PDF document text
    • http://mawokale.myartsonline.com/rikezedusuterezisijigik.pdfIn PDF document text
    • http://minifuduredejo.rf.gd/burger_king_coupons_mydealz.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_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 5688 bytes
SHA-256: c1c2810ad930244f1b6cc4f0d0c555507074cfe39398335e4525f2fa8cfe8d05
font_01_sfnt_off00013d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 11384 bytes
SHA-256: e86c8bf0b8294890b78f283c9f10eb54f3fbe72311e80be5655b1d08f8f7e059

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