Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ff6bf7d5782b18…

MALICIOUS

PDF

78.7 KB Created: 2021-03-06 15:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 71e27e5cef5a2fe98c6a42c6a95c11cf SHA-1: e8544c6e4a5c596205612a767a277c43f7578415 SHA-256: 99ff6bf7d5782b1801e56f03d431c82b6ea0412863002c6605e45521e76bea12
166 Risk Score

Malware Insights

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

The PDF contains an embedded URI that points to a suspicious domain, likely intended to redirect the user to a malicious site. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+reset+moto+g+play+to+factory+settings PDF link annotation
    • http://zemawage.22web.org/jovekofuga.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/VjhijdF/ahlta-_t_computer_based_training.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/ghV55jh/17347570203.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/free_diary_of_a_wimpy_kid_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/hhcOqcm/riwaxujixamagunutukex.pdfIn PDF document text
    • http://retamos.mygamesonline.org/fejewinakoginominutidi.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/cartoon_video_free.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/pijezafojodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7da82c0-4b5e-4596-b2d8-51935cf1d6b3/30242788551.pdfIn PDF document text
    • http://sovotovagito.epizy.com/android_one_vs_android_os.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/gewurorenunotiz.pdfIn PDF document text
    • http://zemoxatovasoga.rf.gd/zunesatopibutuzawafeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d1d2f7-f5f0-4508-b7a7-12fa76f69c54/how_to_give_furniture_a_whitewashed_look.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/13716490199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727c70e2-5948-47ab-aea5-5b1080df0b94/bleach_cycle_to_clean_washing_machine.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/what_are_the_levels_of_army_leadership.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/utah_safety_inspection_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002279e6-5465-436a-a7aa-07b6539d9763/i_am_that_i_am_spiritual_meaning.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/4348457034.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/71276485588.pdfIn PDF document text
    • http://regufowes.epizy.com/book_review_ghost_boy_martin_pistorius.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_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 5488 bytes
SHA-256: ae2110f5753d2d4c4d6bf1ed72b3bc3b01f8be04bf6aa1fca1a23fb64cb7894d
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10136 bytes
SHA-256: bdb60f0ffb9369263aacc6461dac4275662c3028f0ca40f3b6432ec01eb8a314

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