Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c82026b7558e5d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 21:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ca11eeeff9ce017a616a0681970f031 SHA-1: 6bfc630726d743661b86c46de779e0ffd16fb869 SHA-256: 50c82026b7558e5d0bb68acf0a69e2361d5399ab5d9af0511f4e82ac3db37f18
156 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 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 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.
  • 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/strik?utm_term=what+kind+of+tests+are+there+for+covid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fcbe6d2c4785.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/ziwizejeb_gaboz_lakibomowuno.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/amelie_nothomb_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fe52fcc0a81d.pdfIn PDF document text
    • http://tapabafana.22web.org/speech_therapy_session_notes_template.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/36491404717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_604198349c5db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_602d41057dcf5.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/temukavosata_ruwajukigan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_60010a279b04f.pdfIn PDF document text
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/5d5cce5defcde.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/marketing_concepts_and_strategies_6th_edition.pdfIn PDF document text
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/2813057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/odni_chunariya_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/june_2019_calendar_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/quinceanera_invitations_templates_in_spanish_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/latest_adobe_acrobat_reader_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/microsoft_sql_server_2014_enterprise_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/final_fantasy_7_remake_xbox_one_date_de_sortie.pdfIn PDF document text
    • http://jakibijujaxaxof.rf.gd/74760997317.pdfIn PDF document text
    • https://medlineplus.gov/covid19testing.htmlIn 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_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 5212 bytes
SHA-256: 5aad9009c79d9f986631dcf2cc793fb9ecbaaf4c6440858f80a253ef39d91cc9
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 11012 bytes
SHA-256: e41046162a6fbf76d719132cfbbba39b6daafb07f7c5a6dceaa8cbb54120a566

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