Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9784cc07b37a93…

MALICIOUS

PDF

69.9 KB Created: 2021-03-17 08:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: cca5952a5cdb4570cf6670342eeb89e0 SHA-1: a98da953b97ca8d0496d2e84a0da30e54e01a60d SHA-256: 4d9784cc07b37a93b8333c1559a7647e99b67edfa407b2dd98c7560bc9f5f912
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=ayurvedic+yoga+therapy+mukunda+stiles+pdf PDF link annotation
    • https://xanevifoje.weebly.com/uploads/1/3/4/6/134666083/vokux-zojagovudabit-giwuxasimavofan.pdfIn PDF document text
    • http://boothattendant.com/how_to_trade_options_on_vanguard_app9myao.pdfIn PDF document text
    • http://batmbatm.ru/computer_systems_manager_salary_quebecyfx16.pdfIn PDF document text
    • https://puwedogomep.weebly.com/uploads/1/3/1/3/131382223/834702.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/lutibuxaje-xezuse-mopemaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/hIjbdjf/tadutazajewovod.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/3072b8002df7b5.pdfIn PDF document text
    • https://ponejibuwefugep.weebly.com/uploads/1/3/4/8/134879986/wawovutidijolir.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/0YghicQ/hollywood_escape_room_circus.pdfIn PDF document text
    • https://vatizojisizekig.weebly.com/uploads/1/3/4/8/134852150/e17600846fc8897.pdfIn PDF document text
    • https://nekizinatuzi.weebly.com/uploads/1/3/4/3/134325328/basorixafuluzox_vefew.pdfIn PDF document text
    • https://cdn.sqhk.co/vosizijanad/nhinjcT/love_you_jaan_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_ae86ed4f27434469afe83cef10eceaaf.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_7c1dbafb2a1a42e099fb5aed4d0dd95d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0eff66-840d-4547-86bd-cf7c2b6d845f/linux_unix_commands_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637f9dd4-c2c3-444e-b9c9-693f7c5f2dad/jimitifixerogosiketejisem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01d5245-7548-40de-8596-dc2d7ef41240/books_to_read_to_your_baby_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709ed888-877d-46e9-bdc9-16fd64100bca/87339174563.pdfIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_1923dbeca75c404994c506f6c9048a05.pdf?index=trueIn 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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 5784 bytes
SHA-256: c9a9f1c75b850d1ac644752506211aa1698c84ede8c4ed829fa224d403c67e2f
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 9944 bytes
SHA-256: 4fa62c642be0c2863bf25c23a71169f2b5bcf79dd82b98f367360801ddd31980