Malicious PDF — malware analysis report

Static analysis result for SHA-256 450bd608e9dc30cd…

MALICIOUS

PDF

76.6 KB Created: 2021-06-04 04:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b42da2f5e58905e96d588c5abf09effd SHA-1: 70aef17ed1dba6be29a32b9f2d603512a4f0fb8a SHA-256: 450bd608e9dc30cd1aea1ffb6343baf8f78881174688bef1422ef89dd5beec81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=ezel+dizisi+indir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452372/normal_605af402e525e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_605ac8dcb393a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fadoposapat.pbworks.com/f/48879767284.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/jesefofovolufimunafez.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/dizupedevetezafi.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144560013/agatha_raisin_season_3_episode_2_online_free.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/tewubaxuwi.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/suzuki_ensembles_for_cello_volume_1.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144580323/27423684183.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412215/adobe_photoshop_classroom_in_a_book_2021_release_download.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144532206/goguderer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49caf9ea-5e07-4033-98fe-75080d899cbd/67834444201.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/what_are_infps_compatible_with.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12290d92-aa0d-48b5-b44c-f8bd056aa3c4/liwabalefejigodisamiwutif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464652f6-8fc9-4801-bb0f-7bddbec9af79/revolutionary_spies_achieve_3000_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ac1211-c917-4adc-ac55-463cf1f6100e/21335774483.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/conditional_type_0_1_2_exercises_with_answers.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/ejercicios_ecuaciones_de_la_recta_1_bachillerato_resueltos.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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 4212 bytes
SHA-256: 1367567a5b160a09dbb9cb102681369e8ae5e90e96b17e3e6b1f66c447047c08
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 12404 bytes
SHA-256: e660e5236fb74f76ec8aee7ec94f877a576e0391653fe03a234b9d50bcbda530
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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