Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dce5ab4c35d458…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 07:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5385baea38a55359189afd966d1e575 SHA-1: 6ea75156c40bf60f5c97ba98ddc1175fb0481f2f SHA-256: 04dce5ab4c35d45846602df50b63aa9ada97766b7f7e338873f2d14b48b8ad43
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting domains, suggesting a phishing or scam attempt. The primary URL identified, 'https://drafthe.ru/pbw?utm_term=how+to+read+resistance+using+analog+multimeter', is presented as a lure related to multimeter usage. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://drafthe.ru/pbw?utm_term=how+to+read+resistance+using+analog+multimeter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fe874ec88eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fe7262126819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_601998123adb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_6064024d8f9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_5fe8618f17254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_60406794474d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5ff60557c397f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fdef4970a876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_606e1394dd627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcbc68d1adb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fcdcc0ca8777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373259/normal_6002bd49f3508.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476427/normal_60b1bc0720cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_605469517dab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fd74fc81015b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_600ff6af167f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokuwatosat.pbworks.com/f/jukarujagopuderiworikor.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/how_to_cite_two_footnotes_in_one_sentence.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/xefitibo.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/sermones_cristianos_bosquejos_y_estudios_para_predicar_gonzalo_sanabria.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144435105/dafalawetibejak.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426012/sepesikonotakili.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144438462/lean_on_full_song_mp3_free_download.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/62992060879.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5312 bytes
SHA-256: cf6bf76c2d6c37963b217c4ba2eeff9c711c5ca3fa20c423c13daf525da7eb5e
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10304 bytes
SHA-256: 3cfc07cb9a59c74b4cf525893fb42263ea8b6b0131a548c6384d838df4fcaf30