Malicious PDF — malware analysis report

Static analysis result for SHA-256 23135ac50d0fca92…

MALICIOUS

PDF

91.3 KB Created: 2021-03-31 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef4cd44958957a565718e8babd2ad0f2 SHA-1: df985c39d581339b43124a1dd386b896973a8cd8 SHA-256: 23135ac50d0fca924eddc48b8fcd2d557350f5ba559029f48e9b31e74de1e89d
226 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 hosting, suggesting a link farm designed for SEO manipulation or phishing. The 'Fake encrypted/secure-document view lure' heuristic indicates a deceptive tactic to encourage clicks. While no scripts were directly extracted, the PDF structure and numerous external links strongly suggest a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake encrypted/secure-document view lure high SE_ENCRYPTED_DOC_LURE
    Document claims to be an encrypted or protected file that must be opened through a 'secure view' link, and the action link uses deceptive infrastructure. This is the secure-document credential-phishing carrier: the page imitates a secure-mail / document-cloud gate while the link leads to a harvesting site. action link to abused redirector.
  • 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://zajinet.ru/award?keyword=traditional+catholic+prayers+in+latin+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370737/normal_602edebe8cec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_601070c9d276b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_605f91a746e1e.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/2180871.pdfIn PDF document text
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/fubalapedaw_pugilevu_fukusobesatuluv_wonuruwarala.pdfIn PDF document text
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/b5bac645e.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/8432595.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/binofeluzivas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_1ca6cf4cdd914c7b80fd85179aa19aa9.pdf?index=trueIn PDF document text
    • http://wajiletum.epizy.com/class_5th_ncert_maths_book_download.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/nexoxa.pdfIn PDF document text
    • http://jawuguv.epizy.com/book_love_quotes_for_her_smile.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/weather_report_monticello_ga.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_397e9870cb5547229e26730498a79841.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/lisonibekureru.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/angles_in_a_triangle_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/far_cry_1_guide.pdfIn PDF document text
    • http://rewokop.epizy.com/damaraguzabiweta.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_a3e19b60b8614a23819a0e6f688151ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/suncast_175_ft_capacity_hosemobile_garden_hose_reel_cart_175-ft.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/convert_adobe_3d_to_step.pdfIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_62b4a374cdc14da482273522780ec686.pdf?index=trueIn PDF document text
    • http://roxonolabixatox.epizy.com/51139887200.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_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 5296 bytes
SHA-256: dd5b8bba86e98cf7d762239a4d9b777aabb787f9fc3557c3add444e971fa487f
font_01_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 12012 bytes
SHA-256: 7e8ae8d0ba0a36225621a0629a40c7d01fed35df05b93b4e2965826b2fa1d6b2