Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd21502a51e7957…

MALICIOUS

PDF

98.5 KB Created: 2021-03-28 07:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2451e58e8b327a0a2918d66b1c08035f SHA-1: 87744dae99c559bb48dff65cf63e9a1a7b729c13 SHA-256: 8dd21502a51e7957a6195891586192fd02cfe0824f7dc2d1859fc85fb6b3aead
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, with several pointing to disposable hosting or potentially malicious domains, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=ramai+awas+yojana+form+pdf PDF link annotation
    • http://lodujenoxo.iblogger.org/vb._net_2010_software_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_6036314f90fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_600f55593089c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_6006386e373f0.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/alimentos_alcalinos_y_acidos.pdfIn PDF document text
    • http://ginumon.iblogger.org/accounting_terms_in_arabic.pdfIn PDF document text
    • http://shlifovka-pol.website/riichi_mahjong_scoring_stickskrkyj.pdfIn PDF document text
    • http://geleostone.online/4691524068akisk.pdfIn PDF document text
    • http://ziriwurupi.22web.org/betrayal_at_house_on_the_hill_2nd_edition_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fd13e3adf0b7.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/the_secret_dare_to_dream_plot_summary9zhqy.pdfIn PDF document text
    • http://demasaxilasego.iblogger.org/review_for_test_9_quadratic_functions_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jobavo/lexmark_xc4140_spec_sheet.pdfIn PDF document text
    • http://xokifanubede.rf.gd/jumopemuw.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_0c36e124bf8f4ea5902419cc89cfee12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/20279163624.pdfIn PDF document text
    • http://buzetewad.rf.gd/wafirotadeke.pdfIn PDF document text
    • http://futifuzofu.rf.gd/clases_sociales_en_la_epoca_colonial.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_2f8d5904627d40278aa5fe65976264db.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 5432 bytes
SHA-256: ef569991c1d1c28373b7857e463eab653f070f7538fd72d16f16702b5f2bf4c2
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 9752 bytes
SHA-256: 6b1a7e7e553546b0700d2933b2fc2aa2e2efae389490484c73c9df3bb9b8448c
font_03_sfnt_off00014bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD2 16524 bytes
SHA-256: 92f465b30e0845f2df9380a9314ef162616d5242539e89f17f9e03957d7d9efa

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