Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2145ad801ea1bca…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 05:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1b8ce8d3a46350737494874249a81ed2 SHA-1: b784a05227ef83ea8ab5a2b38206f42430c587a8 SHA-256: d2145ad801ea1bca80334c770edbe472248cb4a2ec9dc0447ad75eee33b5249f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous embedded URLs, with at least one, 'https://zajinet.ru/123?utm_term=unidad+de+almacenamiento+definicion+informatica', identified as a potential external URI and part of a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=unidad+de+almacenamiento+definicion+informatica PDF link annotation
    • http://rubewox.sportsontheweb.net/city_of_bones_cassandra_clare_shadowhunters.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/44061443710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_601dbfa4d7bde.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/29009311603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fd3b555509d8.pdfIn PDF document text
    • http://zemegazi.22web.org/tedinor.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/8b888faf-3d3e-41fe-8ec0-5628b5f6c68c/jim_carrey_christmas_carol_full_movie_youtube.pdfIn PDF document text
    • http://malinaliwul.epizy.com/templateref_vs_viewcontainerref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5f952c-8cd5-41e3-9c0d-8639923ce931/sharp_xe-a207w_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0eec1a9-32b4-43dd-b30e-a9158ca59d9a/90167470104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687e125f-d9e0-43ce-b672-be7acabb07a0/53427827712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf270add-c0f3-4da5-82cc-b1433e3aee5c/what_laptop_can_run_adobe_premiere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6b15ee-bf50-41ae-9aa6-f042d91ce2a8/gewewamematexamuwutax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bde7896-a9a2-4a2f-b4c6-6e96b6211dea/xovebewudetizago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98aea6aa-145a-4437-9de0-77ff046feb75/fozisetofo.pdfIn PDF document text
    • http://nebokidib.epizy.com/the_darkest_minds_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2abb4d-2ce6-40fc-b719-4eb6bfc4511b/automotive_standards_iso_ts_16949.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/womazipijojavup.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/28497593989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ac754b-8f8f-4e78-97a9-194cb667cbd9/11445451181.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_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 4980 bytes
SHA-256: 0ad640c269d1fc05a10b7ef8076d2d86074440b75f1e12d12932fac2d493bf38
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 11656 bytes
SHA-256: ce7edf85fd064f8fcf68b794f4ba5dc3a1ef5a3267b7e56da3672375690d194b

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