Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32e40dd8e229c97…

MALICIOUS

PDF

159.9 KB Created: 2021-02-27 11:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6c784867173e754896b5020fccbb705 SHA-1: 9df19fc918defa81320a310880f3527b6459a267 SHA-256: f32e40dd8e229c976e26531408ee00365aa1ffb0c0b39179fe70eb77458cccc9
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 0.9997

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://vilenefex.ru/123?utm_term=what+is+sociology+of+education+according+to+different+scholars PDF link annotation
    • http://alexandreablog.com/how_to_fix_a_broken_garmin_watch_bandd6hbt.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/42f2760ebe78.pdfIn PDF document text
    • http://dontbeshy.xyz/dovosajabodapawovl45c5.pdfIn PDF document text
    • http://urolog.xyz/how_to_reduce_weight_in_one_month_diet_charti9qjs.pdfIn PDF document text
    • http://hookup153.space/how_to_make_a_noun_booklet3l883.pdfIn PDF document text
    • http://gladkoe-telo.xyz/communist_manifesto_book_report7wqej.pdfIn PDF document text
    • https://wofiluno.weebly.com/uploads/1/3/4/4/134470017/binebisufujakusijex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5ff779c1669eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_6004dd3048567.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/5487158.pdfIn PDF document text
    • http://nature-ital.space/fees_to_sell_on_etsy_ukjthkj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_601903ba0a970.pdfIn PDF document text
    • http://d-youtube.com/1337x_download_movie0o8k1.pdfIn PDF document text
    • http://vsedlyatebya.xyz/subchorionic_hematoma_treatment_guidelinesomhln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414360/normal_5ffbb51d39131.pdfIn PDF document text
    • http://introdom.ru/476624788960ksuz.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/wusone/admin_dashboard_template_free_colorlib.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/84954874653.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/extech_chlorine_meter_manual.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_off00023a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A2C 5400 bytes
SHA-256: 60374a7f50b8709d49b34180a8c0068759381a60a6a043d09453ac0cce629bfe
font_01_sfnt_off00024c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C93 10832 bytes
SHA-256: 31cf1d0557fe6a8c95326e88aad75de5d7374c28d3ac6693de434f9cb9d989de