Malicious PDF — malware analysis report

Static analysis result for SHA-256 778cc3a5ab18a161…

MALICIOUS

PDF

84.5 KB Created: 2021-04-19 12:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d244f0562dc329f3df91af2f81d4b482 SHA-1: 5e62c65f835c189afc3edb6578ad24a7603079b2 SHA-256: 778cc3a5ab18a1615099549a14348e72e92d32505d07d0ed070206072628b2ea
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as redirectors to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=cisco+sg200-50+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601f1b0976d6f.pdfIn PDF document text
    • http://crystal-light33.ru/ielts_essential_guide_writing_task_15kui0.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/dgegcpd/gojugijibuxazakefidugoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/NhejcRi/texofelisutagoxixidudawo.pdfIn PDF document text
    • http://usmileofficial.site/motorola_surfboard_sb6121_password_resetn6evj.pdfIn PDF document text
    • http://leomannapov.com/rerijilodinewijukilignivpr.pdfIn PDF document text
    • https://cdn.sqhk.co/dilijenaka/foOBtEh/sisuwuwow.pdfIn PDF document text
    • http://fapseo.ru/hollywood_reporter_roundtable_directorsguwny.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/iOjfxml/91087625526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_603ff0dd57070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fe6cd92bf6af.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/jgxidBt/sijetar.pdfIn PDF document text
    • http://stankovit.ru/dutch_sheets_intercessory_prayerjiv6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvazi/67577341184.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_9ab213a669e346f4b726138ccf3db9a1.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_8a38402e38c44274b1be97c715121ec4.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_add46e7213874144b206ab54100d639f.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_08ffcf5217414a43bd92f51337b05a68.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_e332a1c39776487da0624f13185eee0a.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_9b3eca395afe4fc49470e97dd7fe62da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/yahoo_mail_to_desktop.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_646323bffeb746c5a88faf897e489f54.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_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 5096 bytes
SHA-256: 41a18fba20291461938da812b6d83b3839e280cf7e437c15c64efbd11597c848
font_01_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 12184 bytes
SHA-256: 060603aa54a08379dd36bbc6473b7d9707d9f2d744bd28c8a783bcddf1edc67e