Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e684ea239fdff30…

MALICIOUS

PDF

78.0 KB Created: 2021-06-03 01:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 404bf64ac1a85b48fd8ac4cf18e4e537 SHA-1: e770f5cf5f48f45a5660eba15ed0679172976299 SHA-256: 8e684ea239fdff30c3334ec71d9de4e516163eb75972490989df91582c011fcd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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://midufefew.ru/123?utm_term=cross+multiply+to+find+x+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470830/normal_603698a81173f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405925/normal_60b1b25fb41ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_60421d16b0470.pdfIn PDF document text
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/kopasem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_600f8e4ff1974.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/fdb5e3a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_6039434369049.pdfIn PDF document text
    • https://xibotizumeg.weebly.com/uploads/1/3/4/8/134865631/caf92528d.pdfIn PDF document text
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/af40dae347b.pdfIn PDF document text
    • https://wubiwadodeta.weebly.com/uploads/1/3/4/5/134577579/15899d4cb27.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/2d458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd651ea4a53e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5ffab77f086fb.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/ec304f15-48b9-4e3a-8efa-f005f2122809/best_internet_service_provider_in_hadapsar_pune.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144423075/tejapim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c637a5ee-c4d3-48f4-b686-4ed7ddfdd228/the_complete_manual_of_suicide_chomikuj.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144509790/classifying_animals_worksheet_answers.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/twilight_saga_part_3_full_movie_in_hindi_dubbed_download.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144523878/advertising_and_integrated_brand_promotion_download.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/35984062278.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 5300 bytes
SHA-256: 00b3336340afebd8cbc8eeee80fd5ca0247a159a6d7ce443df3991a2b6d0b11e
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 11248 bytes
SHA-256: 844d7bd7938a36a7c772e6889a2bdeebcb9df8faf7725763d9d690ca47807293

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