Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4ba80de3849a62…

MALICIOUS

PDF

80.6 KB Created: 2021-06-13 18:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 971496eeabab96300045524ec1e242e2 SHA-1: cb97de735dbcf93c91a7eae9257fbdd915c35111 SHA-256: 9a4ba80de3849a625d4b63f7b758be096df10b1fc425cbc4deac8712cac429b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms on disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/pbw?utm_term=cheats+hungry+shark+evolution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60195f01eeae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377400/normal_5ffb1c19afd7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_605a724b14370.pdfIn PDF document text
    • https://xowetigebunagu.weebly.com/uploads/1/3/1/6/131637365/7943873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_60691ff17e654.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/binusob-xavujowezowi-supoxezusezutob-wekigudixux.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/e2646d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_5fe5896f30118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_60610c6f1162f.pdfIn PDF document text
    • https://lezogujivezubix.weebly.com/uploads/1/3/4/8/134878846/66a62a02e467b63.pdfIn PDF document text
    • https://vanatajeto.weebly.com/uploads/1/3/0/7/130740174/gamovavidako.pdfIn PDF document text
    • https://mutomutozuso.weebly.com/uploads/1/3/0/8/130814133/muluxukulunujoruk.pdfIn PDF document text
    • https://bomigisojibovo.weebly.com/uploads/1/3/0/9/130969974/rezumumolon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5ff428bd08ddb.pdfIn PDF document text
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/7484182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_603b0a645abce.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/a4bc72a435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144581340/exponents_and_powers_class_8_icse_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b35ace8-d05a-410e-9345-15ce6f81f476/sonivelelurifexavunisap.pdfIn PDF document text
    • http://vutajake.pbworks.com/w/file/fetch/144992685/andrew_george_gilgamesh.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144562872/92862982016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88817656-e002-4e63-bec9-457bca1b16fd/how_to_service_a_40_hp_mercury_outboard.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/final_fantasy_x_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b922a7-6ac1-4cc1-937e-8c3c14d85ec2/pdf_lista_de_verbos_regulares_en_ingles_presente_pasado_y_participio.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_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 5080 bytes
SHA-256: 384ac9d77320a42c0f5f4c8912b77366c85f06a17638afad42fbe2f47fa42045
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 10840 bytes
SHA-256: 3a97fc998502f4d0289e43fa26c1e416d9ced31d5c1cda3e1e40afcfef1ba261