Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe21e42136e3201…

MALICIOUS

PDF

71.9 KB Created: 2021-03-27 22:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01c18fc2025ca5b7156933534d96a69a SHA-1: 93569971817df939406a2f8884489c12e9cf961a SHA-256: fbe21e42136e32018fd18858d9e740d13829209520b69c601ab4e75cee42092a
186 Risk Score

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 0.9996

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://nipisod.ru/123?utm_term=daycare+child+information+sheet+template PDF link annotation
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/tuliwurogurisutoni.pdfIn PDF document text
    • https://rewekofewu.weebly.com/uploads/1/3/4/6/134654248/855628.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/9005284.pdfIn PDF document text
    • https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/5536695.pdfIn PDF document text
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/3ec0c04.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/pulibusadiz.pdfIn PDF document text
    • https://kenitavujene.weebly.com/uploads/1/3/5/9/135977886/9964420.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/dbbb3032db5472.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/goxapopotupizazud.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/wujozu.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/93098837865.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/sitezupupir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_3f6954539e2b4667a171189df0dd4b93.pdf?index=trueIn PDF document text
    • http://sobogasitizi.epizy.com/63145071548.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/letak_geografis_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/dan_brown_books_list_in_order.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_bb463e353ce342b78104a5b9e053bc97.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_f6c661e9330442ef810f9ebaed0fa74e.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_a81bc13cfb1643e395db96247511c4e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/ketizavaf.pdfIn PDF document text
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_ada4dc131e3743c98500f5febaa4d6c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/route_apple_maps.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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 5496 bytes
SHA-256: cda2dec6bb07971be938591abf3df68558a87e278aa7131c7469289f66f4ebab
font_01_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10528 bytes
SHA-256: 6abe4ae4147f4e4d9ec356ba35d90d5b361cc14da74700fca0013167bfd95705

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