Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadb5118e48c5142…

MALICIOUS

PDF

83.5 KB Created: 2021-04-20 03:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3ae3081ef448c10fb7d30cdda0ca01f4 SHA-1: e8fac37cbd6f632165955bbeee5f1f29f675ae77 SHA-256: fadb5118e48c514242a5bcea166dbb9c9bfb03dc9711e308e7ceba8c6c86a425
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://jumiwimov.ru/strik?utm_term=national+design+specification+for+wood+construction+2005+pdf PDF link annotation
    • http://lulopoboxefon.scienceontheweb.net/benny_s_dispatch_sheet_music.pdfIn PDF document text
    • http://circulshtangcalip.website/how_to_fix_a_broken_thermostat_fridge97qsd.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/117018.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/cf64d3500.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/concierto_de_aranjuez_brass_band.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/12980576292.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/jegimokib.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/4176045.pdfIn PDF document text
    • http://peuly.xyz/rusunegowetolesenesgclg.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/atal_bihari_vajpayee_poems.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/akI2Rii/mansions_of_madness_expansion.pdfIn PDF document text
    • http://carbackseat.site/35425864383p5sbf.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/idANhd0/html_editor_windows_free.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/cake_i_will_survive_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/sjbjdha/kivamix.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/Ohbicih/system_launcher_miui_10_apk.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/28d55711-a219-4e1a-b87f-45ba9f34187f/back_to_eden_book_by_jethro_kloss.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_db2adc4c1a2249d8948903c5e856ba80.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_263656ab59b14a588d5a9d7c38c6347a.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_1879fd9cfe9b4e67838231314e9a910c.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_63ee785eef834809ba72242bfa637f8a.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_24f8e6c391cf40caa83f37050736a537.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8145c2c-0737-4d09-97ce-fd8375e7b84d/skeleton_crew_stephen_king_barnes_and_noble.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_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 5780 bytes
SHA-256: 213d12947dafe972e47efb777a019a048cfbf7add46d8c2ed06867d75a3223e4
font_01_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 11720 bytes
SHA-256: 7927132f54de38e8ba972a63c1905860d0c24a8b97a6b37ab48c323cbbe3aa7e