Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e81ec87b4694e3…

MALICIOUS

PDF

124.3 KB Created: 2021-03-27 10:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df37b00e19c6ac79449773993ef7e209 SHA-1: 748d0d3dde6554ef1060eb1b6a70c4769fd1d5dd SHA-256: 45e81ec87b4694e3172821ced5357887dc585d1c5c0991fac570c333b2b753e0
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 0.9995

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://xezojetit.ru/strik?utm_term=social+contract+theory+pdf+notes PDF link annotation
    • http://zukixulen.mypressonline.com/ecological_significance_of_bryophytes.pdfIn PDF document text
    • http://natur-bio.space/banularokekerazojifanuliasdzy.pdfIn PDF document text
    • http://katermore.ru/redirukafxan1b.pdfIn PDF document text
    • http://card2card.live/fifth_third_bank_hours_tomorrowyxxc7.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/guzomakidakivimud.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/lefujif-vebixapifalojuw.pdfIn PDF document text
    • http://nefritthebestthing.site/ionic_compounds_pogil_answer_keyocdd6.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/7929816.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/190da41ae96.pdfIn PDF document text
    • http://bbflowers.net/53831368073m4o45.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/edenpure_1000xl_heater_parts.pdfIn PDF document text
    • http://punejew.mygamesonline.org/84988521590.pdfIn PDF document text
    • http://therarbooks.com/asco_guidelines_head_and_neck_cancerq32se.pdfIn PDF document text
    • http://hhizmet.com/can_i_get_xfinity_on_rokugtb1u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_81e55880e29540df8567cb7045b3dc4e.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_84a5aa2f6df2452c84134c43b3cdaf5f.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_d82b979dd8574d37a9d6c2a9a335eb43.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_8c0320e6c68b4c6a9f43e5d6592589b7.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_5dde5b89e51d4e6eb5e16f537df43c14.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/manually_operated_pipe_bending_machine.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/93279121842.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_e2a03df9b6224f5281611998635fb7bc.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_34be9bdf38ea4c68b8af46356158b9db.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_ca6fbe44355548f3b5829c3ee4f0f416.pdf?index=trueIn 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_off0001abd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD1 5448 bytes
SHA-256: 6acf0c076dbd4540e4ad2c289c8246b456723f9bf95f2b4ddfad1c0e3e626c5f
font_01_sfnt_off0001be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE5F 10912 bytes
SHA-256: 82b6664814ac9085eedb853b8b49721d77ad3aa9852f3491f8e9c43a723099e7