Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf05692ff099625…

MALICIOUS

PDF

70.7 KB Created: 2021-01-19 07:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 5fbe52f465d9def96ca30909b83cb88e SHA-1: 3b9481de61a51fc1c4980af11363d2e5d0604ea8 SHA-256: caf05692ff099625198dabc5a1576d85aaffe8d7ee0b56979e834470e372f64c
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=retro%20games%20collection%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_5fd641d334852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5fba63762f279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5fc0065d0250b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8996203bdf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fd91665977a0.pdfIn PDF document text
    • https://site-1253340.mozfiles.com/files/1253340/granny_smith_apk_obb.pdfIn PDF document text
    • https://site-1201024.mozfiles.com/files/1201024/venepukasas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fee98ab02595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_5fab1e530b45b.pdfIn PDF document text
    • https://site-1184420.mozfiles.com/files/1184420/online_video_downloader_app_apk.pdfIn PDF document text
    • https://site-1175781.mozfiles.com/files/1175781/cello_sheet_music_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_5faac98bbb4d8.pdfIn PDF document text
    • https://site-1175290.mozfiles.com/files/1175290/past_continuous_tense_worksheet.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/vavapekadoliti/zilojawolaniluzororox.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/dujibujax.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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 5356 bytes
SHA-256: 0c6a4ba50debf88e0d2dccd0f3ad5f0c764540c1afcd125857da14eefba7047f
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10808 bytes
SHA-256: 0257d0c915b391c7884cbebb1e8710098af87a83614c932194e850a4c0c147d0