Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb8d1595c391fa3…

MALICIOUS

PDF

67.6 KB Created: 2021-03-07 11:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0674db673fecde5028786349173165e5 SHA-1: 92d71af73167417c8431f1d1caa9a6f3ac5911f5 SHA-256: 4bb8d1595c391fa32fba22de2338b2b795ffc320d60ad95e58ef4e85f1e3560e
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://soxebez.ru/wix?keyword=go-tcha+evolve+manual
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5fe67517aace9.pdf
    • http://pitushok.fun/what_is_the_ufc_weight_classesyj548.pdf
    • http://alania365.ru/extending_mendelian_genetics_worksheet_answers1t3b4.pdf
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/640c97c26.pdf
    • https://waxizeno.weebly.com/uploads/1/3/0/8/130814339/4f25e88.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/xuwiteluzopu_tenuwekoxez_romalajigorij_rifuwapinezilad.pdf
    • http://all-host.site/abstract_paragraph_in_apa_formatqiqvi.pdf
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5fe58db7359f3.pdf
    • https://ximilebikunupi.weebly.com/uploads/1/3/4/8/134875253/desesosurumaba.pdf
    • http://italylife.pro/a_critical_review_of_a_journal_article_examplengkpg.pdf
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/rovez_kadufejulopu_lafewisap.pdf
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fff4671a0e57.pdf
    • http://dalnoboyi.xyz/business_communication_bcom_1st_year_book_in_englishtg6z5.pdf
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/gonagofuvute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_37cfb37bbc54401fbe44bbf429f116e2.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_e757a82c904046cab1e77f41a689d7e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c97ef997-1007-4af9-9593-1b0e93206128/canon_mx890_scanner_software.pdf
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_ba57128ed6a64d33b2fda56884954385.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe188308-cafe-4d1a-9777-499c62a55159/best_soccer_coaching_board_app.pdf
    • https://uploads.strikinglycdn.com/files/76e921ee-6e6f-4b11-9ef8-86e1ca345627/ejemplos_de_dispositivos_de_procesamiento_en_una_computadora.pdf
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_b5ccf9896b774dada9125f0b6292de79.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd46.bin
56d6908e15e31e99e5a368e78d0b91a54f8b0348ac15e2a8f69231f2b77b9ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 4888 bytes
font_01_sfnt_off0000ddd4.bin
43881578bbbb5f7feb1676627b35e99333ec174310ebe104bd2629bc7bb719be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 10392 bytes

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