Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dc4d4480d34f25…

MALICIOUS

PDF

81.4 KB Created: 2021-05-03 22:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb4e6d65c0e115c68649f33968650bd2 SHA-1: 707ad6359bef914dbea76c65b56a0f74fcac669a SHA-256: 66dc4d4480d34f2565751a658b7d0d75d9dbed3cb8670b3a720acc37ec132d8b
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 0.9993

Heuristics 5

  • 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 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/strik?utm_term=how+do+i+turn+up+my+vizio+tv+without+a+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465145/normal_6057db9098ff3.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/gulos.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/critical_thinking_in_nursing_education.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/Lih1jbl/nccn_guidelines_lung_cancer_screening_2019.pdfIn PDF document text
    • http://gixuloponij.mygamesonline.org/vezejarazunigataroxegi.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/giV63f8/7377876502.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/canon_dslr_camera_price_list.pdfIn PDF document text
    • https://cdn.sqhk.co/sugigevapure/ijxMrie/digunodolozitatizuxagilo.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/free_lightweight_reader_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_606352231aeb1.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/gWiejcj/15608754730.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/catalogo_de_cuentas_contpaq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_601e0d528ebe5.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/hajgojd/vegan_gluten_free_chocolate_cupcake_recipes.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_605255fe6d7b8.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/a_natural_approach_to_second_language_acquisition_and_learning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowofosepenomun.rf.gd/celtic_mythology_and_religion_alexander_macbain.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/3274394186.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/vemabilenotofu.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/46672083569.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/71020569269.pdfIn PDF document text
    • http://gokutirimavav.rf.gd/ler_cinquenta_tons_de_liberdade.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/the_night_manager_cast_episode_4.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_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 5256 bytes
SHA-256: 1698cea85e16f51239e061f127eb6c25de781c03197c94fa771c53365408189f
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 11064 bytes
SHA-256: d3457b0a0b25374b2a48ca38219331ef6f0f5bf3891cf0eeae64ab54c6c441b1

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