Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf11f2ba7c157de…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 13:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92b7d40eb6b18518a38393c41f32dfc3 SHA-1: 9cfa8c08a94f370504c8a6a061a55cf161847756 SHA-256: fdf11f2ba7c157de0e142ce8a20c12a02421ab680149ac7ca55edc580c3a01f2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/award?keyword=pathophysiology+of+cardiovascular+disease+pdf PDF link annotation
    • https://cdn.sqhk.co/xewafazuk/6jagiib/police_auctions_cars_nsw.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/egdPgjU/video_player_android_source_code_github.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/cghifhh/39910843475.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/aVJhbGi/beragavowamumelo.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/E7hjAie/gagujewasimerowexo.pdfIn PDF document text
    • https://jotowaviroretog.weebly.com/uploads/1/3/4/6/134604658/feddd86d866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_5fcbd0395b23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_602e0507b5761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_600fcd32bd2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_604ca1822cc40.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/mimofopufomugokas.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/mibirape-gojasamafuxunix-miwuragonujo-saxokepamewir.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/nesegowez-bazewivekafobiz.pdfIn PDF document text
    • https://sumewawuvivifos.weebly.com/uploads/1/3/1/3/131380344/3735606.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/FtgcUVu/lock_screen_wallpaper_on_iphone_6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_602a1885cf0c8.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/8590905.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/ee758cb6316.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/527596.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/ZDG8jae/65252079988.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/XRigAgc/pupugijalod.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/ade2c957-efd5-4a0f-b20e-032d1a851346/13961666924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f705ceaa-e8dd-46e6-9411-f275c4f1858a/65695188951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc4558b-feb2-4a55-bfd1-6633cb859938/xolojamumobovururasiteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07440ea7-9fc5-40dc-8790-fa4878d3171c/principles_of_electronic_materials_and_devices_3rd_edition_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6700fd94-accf-487d-b37e-cb5a61739d14/what_is_the_current_interest_rate_for_refinancing_a_mortgage.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_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 5580 bytes
SHA-256: 395efcd4f6cde9a8a254ab16bba606ea91d7499f9d5e4f902aaed20df127b4cc
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 11496 bytes
SHA-256: ed4c7f9dcc83f5a2c9680e811be607b820fc4aeac2347a7f39e4ebd4b8d10724