Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93b5a4684f89a50…

MALICIOUS

PDF

76.4 KB Created: 2021-04-20 09:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d50f470d6b1179c8614b80d229fd6c3a SHA-1: de703cef57ef85824e790dc82a53891117ec555b SHA-256: f93b5a4684f89a50dfbfbd6e9f7065fdc47f16aff3a8f5993e465f11b2a23545
126 Risk Score

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 0.9956

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=black+and+decker+7+1%252F4+circular+saw+blade+change PDF link annotation
    • http://fibisazorowax.mypressonline.com/vizusejetonaxidiladega.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/KPigie3/star_tribune_sports_twins.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/geometric_series_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/dGjfniV/what_s_wrong_with_you_meaning_in_marathi.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/tofomitolixemekimimi.pdfIn PDF document text
    • http://nukobom.22web.org/nickel_alloys.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/dagaxumope.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/rPhhiat/totoresesozavojuxafomip.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/12055600838.pdfIn PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/lupefexil.pdfIn PDF document text
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/beniwofawize.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/bDhcji2/whack_your_ex_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/whdfjjc/thorax_location_and_function.pdfIn PDF document text
    • http://wopedejani.iblogger.org/fidelity_contrafund_commingled_pool_annual_report.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/76835196345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwafugupek.epizy.com/19887810182.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/what_is_a_logical_reasoning_test.pdfIn PDF document text
    • http://dugerem.atwebpages.com/76395754383.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/33538562985.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/48210656911.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/wheres_my_dc_tax_refund.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/51778288413.pdfIn PDF document text
    • http://ravigokabuf.rf.gd/basel_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/honeywell_alarm_systems_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/oxford_english_grammar_course_book.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/buenos_y_malos_habitos_alimenticios.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5800 bytes
SHA-256: d4ea8c0fabcb0284363c499ebd63cd6a5208654c26c73034bac5f6d3c5c090ed
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 10936 bytes
SHA-256: e8cb618c2f914df452841f2f4426b749c582a3c4fd33233f44cbe70b594ec7c4

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