Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8ce1cb489c3ac7…

MALICIOUS

PDF

81.2 KB Created: 2021-06-09 20:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a5d2cda11dca34e3fd6074b39a90e31 SHA-1: c2817d8bde67da238980a7c5a0820e4b40bcb50b SHA-256: cd8ce1cb489c3ac7285b6f342cf500e446bfb4f227bc7e385020d9b143ec5472
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 0.9997

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://kuzutuzo.ru/123?utm_term=android+authority+pixel+2+xl+giveaway PDF link annotation
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/kurazaxazuretuj.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/b2d82197dc3f.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/fevuzuwovavag.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/nalumiriwuv.pdfIn PDF document text
    • https://vadurijale.weebly.com/uploads/1/3/4/5/134590900/jitadazimafusup.pdfIn PDF document text
    • https://jomunibudax.weebly.com/uploads/1/3/4/3/134342604/nozes.pdfIn PDF document text
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/sojifuwewofi.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/686291c7d04.pdfIn PDF document text
    • https://vamoketuvet.weebly.com/uploads/1/3/3/9/133999376/fupamatokaku_poxifusaboraji.pdfIn PDF document text
    • https://xovajuvomupug.weebly.com/uploads/1/3/0/7/130776021/8648046.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/repikodejove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemeganavon.pbworks.com/w/file/fetch/144684111/97281007808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877313e4-503e-4ecf-ae81-94e4a33b2444/the_instant_pot_electric_pressure_cooker_cookbook_easy_recipes_for_fast__healthy_meals.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/xodetuxemumekafoneku.pdfIn PDF document text
    • http://xedenuw.pbworks.com/f/76723179616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e02f02e-60a5-4a22-9be9-9e1bd7a0d726/mubig.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144473388/58065911986.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/vofipifofiv.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/f/dujenizikereneripa.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/75300475460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda9799d-0153-4e8a-a1ed-ef800652fee4/bose_universal_remote_codes_foxtel.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 5488 bytes
SHA-256: 6df1cfcf480b6543d4236bdd8faa5c3270fcfa7b8232f1636a131b1812b0788e
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 22424 bytes
SHA-256: 14bf7c90087a5a092bf48689c0baaa8816558c2010da530bf3f1b0f7159b5e6a

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