Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38be94d899d79d0…

MALICIOUS

PDF

72.4 KB Created: 2021-06-10 18:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e052b92c3abd8e9034da15fe9ad57b90 SHA-1: 2b11d9c75aac66868f581b54edac59ad232590be SHA-256: e38be94d899d79d026c4964569fdd86f704f138f7994a0ca99d02bc054ac13f3
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://nomylo.ru/pbw?utm_term=khatrimaza+hollywood+dubbed+movies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fe6a59139660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_600b2d307accc.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/74ca4396-61fa-4195-970b-14b7ef6b1a70/74556664456.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/53063708089.pdfIn PDF document text
    • http://zixememot.pbworks.com/w/file/fetch/144733623/how_to_pair_bluetooth_on_alpine_cde-133bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd49fb04-7a64-4ab2-8633-f4a8f20aa478/fokapufujuwenoxakozofove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab9f6f9-ac92-4ee2-97dc-52dbd5844e75/33234477734.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/rujodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64216ed3-daee-48b8-be69-c395105c25bd/evinrude_6_hp_outboard_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1173e540-a13b-4deb-a95d-321e05ac92d9/daily_study_planner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7af445-c323-4d75-b0cc-e9a0a7f85543/85708069548.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/12412311865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80826711-b57c-41c4-9e7a-f0f8d670e2d0/mathematical_methods_in_the_physical_sciences_mary_l_boas_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749484d1-25ad-4240-ba19-045b6e805335/28353415662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9e6f89-ab63-4d01-a0e5-359ef9cff0f7/pikejimezozatefipasi.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144558318/fieldpiece_sman460_parts_list.pdfIn PDF document text
    • http://gapufipi.pbworks.com/w/file/fetch/144656130/26599135510.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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 5480 bytes
SHA-256: a0e133f5f9a8c97e47aeaaac7f95cfeeff73150c24bc62a4b6239488bc573883
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10800 bytes
SHA-256: cc5532f48ad324375ddd6ebad089f5a4553c35cfeeb45642c07bf299352d031c

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