Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a74bd493847342…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 15:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 14410dea6af3a22b6ef3fa8092a37d2c SHA-1: b17796a60422e43bd4f322504772c914452d24b9 SHA-256: 25a74bd4938473427e6882cb21618a0d85402029e3d3106de00bed31b9ca2cae
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure, but the presence of the malicious URL is a strong indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=a+textbook+of+chemical+engineering+thermodynamics+by+kv+narayanan+pdf PDF link annotation
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hixhahb/sequoia_capital_fund_management_llp.pdfIn PDF document text
    • http://blue-tick-central.com/harry_potter_libros_coleccion6d3r9.pdfIn PDF document text
    • http://dress-russia.ru/3995283249661uag.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/heBjcia/variedades_de_milho_produzidas_em_mocambique.pdfIn PDF document text
    • https://cdn.sqhk.co/belebudetub/6jvhcii/viguwezopuvutixagaposuruf.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/hfowJjf/shaolin_kung_fu_online_training_part_2.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/23391920-2f1b-44c8-ad22-170c5b407f8c/how_clouds_make_rain_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/vevitegaguzusebikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fde8f7-101e-4300-8035-558d5f76bd0e/81420284753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aa6453-6620-4983-8f54-b6d6085b9db7/cannery_row_john_steinbeck_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/accent_color_android.pdfIn PDF document text
    • http://ramogefakox.rf.gd/37137547240.pdfIn PDF document text
    • http://nuwumexuxesi.epizy.com/gixotemaru.pdfIn PDF document text
    • http://fimamuvumurepu.rf.gd/weboboxokifipexezozanav.pdfIn PDF document text
    • http://vabagez.rf.gd/astm_e8_tensile.pdfIn PDF document text
    • http://dasufolizimifub.rf.gd/spotify_premium_apk_latest_2018.pdfIn PDF document text
    • http://rofixalo.epizy.com/audio_lingual_method_definition.pdfIn PDF document text
    • http://levewome.epizy.com/nafuzimulapotelin.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/zatudite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdb0e9b-a826-4e68-ae03-f8dca83e5865/harbor_breeze_fan_remote_control_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5d4a1d-7f67-49da-bfaa-5218dd2429e8/52376599029.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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 5992 bytes
SHA-256: 0a3e07404ea38b0869b80073af4efe7f03364bebd09975eb95dcd684e81a412a
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10820 bytes
SHA-256: b4ce3d44eecee8b0b72ee6442790046783f5b7a9ba6f452972e500936ea71cf7