Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c27fc3a1f8187d…

MALICIOUS

PDF

95.4 KB Created: 2021-04-10 15:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb99183e6fcb112cb8955e63f246b609 SHA-1: 1baae0f4ced3cc345c7a41fe85e2360a18db9158 SHA-256: b8c27fc3a1f8187d51d40509df78d73b9ae0bcfc728a5eba4313431125c2426e
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-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://soxebez.ru/strik?utm_term=briefly+discuss+the+history+of+islamic+education+in+nigeria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5fd99dc2918d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_60558ced2d297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fdabf547d807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_604513bdefd40.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/adobe_converter_free_download_for_windows_8._1.pdfIn PDF document text
    • http://pro-komp-master.website/buzuzokoxo3a63a.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/gapovidudewedawasekinazo.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • http://tixshopclub.space/dna_extraction_from_onion_lab_answerssdkby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/what_are_the_rivers_of_europe.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/22758944618.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_3e973fdae6e4435c9f09e726e3ccf0e0.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_c9311984289e466e9b1047de17996128.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_f60067a852a542e496a5125212448708.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/reverse_image_search_google_images.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/how_to_change_honeywell_thermostat_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/60795923478.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/zugov.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 5584 bytes
SHA-256: ffea7e1a0d23525f20aca04df7bfac8c43859ae6cdf76606b703302f3d62de50
font_01_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 12592 bytes
SHA-256: cb30a0c61efaf3cff57d394537ff1c773ccae5952626145eb3bedbc8e0610c3d

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