Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc43f3c3ee0c923…

MALICIOUS

PDF

71.1 KB Created: 2021-05-20 13:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ea3dc37e33950a2c47ef2233a6758ad2 SHA-1: eb3d67881b85ea51236586b50b278044a959c6af SHA-256: cbc43f3c3ee0c9238293860335b81926d349486f957482df5babba493e52e3cf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=o+breve+catecismo+de+westminster+pdf PDF link annotation
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/6f0d29a1b67ab.pdfIn PDF document text
    • https://foseduvix.weebly.com/uploads/1/3/4/4/134491956/kazewutul.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/sixifusakutoniziwu.pdfIn PDF document text
    • https://sinujezujano.weebly.com/uploads/1/3/1/6/131606051/8627121.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/1441446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_6063ecd006a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601171e15119f.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/9693f3dce92b.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/6062636.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/ximirozaxedujiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5ffb72f4ad352.pdfIn PDF document text
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/70d03b0666b3.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/muzajegefefup.pdfIn PDF document text
    • https://gibotekiwifij.weebly.com/uploads/1/3/4/4/134444926/mupupetafukajafojel.pdfIn PDF document text
    • https://kipejuxi.weebly.com/uploads/1/3/2/6/132682137/pikiwa.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/f050fe2ca2.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/e31c7f0f-7044-42e4-a37e-6c6ce1a7da14/vumepipemulewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e56aed-2305-4308-b9c1-f6765bd2ec80/2490962020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566234e4-92ff-46c6-9849-2d032f524890/what_is_project_scope_management_plan_and_what_does_it_involve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377deb10-47a0-4602-8759-585067d2809b/what_is_considered_exposure_to_covid_alberta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d38df04-277d-4814-9d23-03d7f9677fe9/possessive_nouns_worksheet_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5a7329-0fdd-4401-a63d-fe0c4c10a2eb/what_disney_movie_is_based_on_hamlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb60d74-12bd-4296-bb9b-8d3d9ce3d954/kefanej.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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 5588 bytes
SHA-256: dac312fc9397091d7bc5a7469ff064bd89f3b5358d7c6b2f7c6da78c4b7f5c5e
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 12388 bytes
SHA-256: 5a10060eb9f295d9f9a59a2d4d304fb4da4dffd22a0f95ea6624a89a0f94767b