Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ede531bf60fde0…

MALICIOUS

PDF

97.8 KB Created: 2021-03-31 16:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee1ecdbd935dd67893d789033306d32b SHA-1: 6620a620a1e5a0aed90d4ebe1741815a2fbdd5b0 SHA-256: 25ede531bf60fde007745a464c0ba6a9e260219451ba7b143c1beedae923fcb5
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to improve search engine rankings or redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The presence of a URL related to 'adobe acrobat pdf reader windows xp free download' suggests a lure to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=adobe+acrobat+pdf+reader+windows+xp+free+download PDF link annotation
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/9518211.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/megewijimatokesan.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/6836285.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/3021667.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/90b0632.pdfIn PDF document text
    • https://cdn.sqhk.co/madobeborozu/iigqhXV/top_100_station_radio_frequenz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60407952f3135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5fcbc7fa2e2db.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/liziwopafabajozip.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/HEgdoI3/67536193067.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/9042613.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/11749322673.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/lolovekusigamuf.pdfIn PDF document text
    • http://xoxapepagaxon.mypressonline.com/39963820310.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/como_crear_con_imagenes_android.pdfIn PDF document text
    • https://dubakaxejevam.weebly.com/uploads/1/3/2/6/132696109/nulow.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/mobile_ad_hoc_network_research_papers.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/nanisofese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fd0640c96e10.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/eo0ihij/neo_geo_battle_coliseum_rom_winkawaks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/grade_4_grammar_lessons.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 27112 bytes
SHA-256: c49c6476b1c0e2c2bf90b2d40e35bc9b4d6da58d6d8c70522e0ee74202a2363f
font_01_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 5436 bytes
SHA-256: 43b3f77afd21e6fa9498fe4e639f674664a3c6da6707a72a2d5232bd873c1493
font_02_sfnt_off00015327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15327 11100 bytes
SHA-256: cbee8ca8493caf7f1fb65e43d7b5a7fb6c8b26a4c1cba8e2166aa6b7cffb0baa