Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a9b328a4d55445…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 16:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 32cf828288be2a05b13e763e44f3b104 SHA-1: 780be161c400385db0fa5dba1e61194d5e5986ee SHA-256: 36a9b328a4d55445a1b2344ca5957a75cccc56a39f9e9f9a1f9b8e1a55e7032c
186 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. It uses brand-impersonation credential phishing. 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 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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/wivufasabu_witiwutexufokud_bevefijepefez_zubiparaladep.pdf.
  • 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://crophysi.ru/wix?keyword=asking+for+directions+in+spanish+worksheet PDF link annotation
    • http://mx50off.pro/altec_lansing_mini_h20_3_waterproof_bluetooth_speakerc2y4e.pdfIn PDF document text
    • http://ergors.space/jexifosarulikomanolzh.pdfIn PDF document text
    • http://vash-fasad.live/zezivatelisadufestxvln.pdfIn PDF document text
    • http://iclod.tech/insert_copied_cells_in_google_sheetsm67li.pdfIn PDF document text
    • http://rmk4sale.xyz/zinasesu57.pdfIn PDF document text
    • http://beststudent.fun/how_to_get_knots_out_of_climbing_ropevgqnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601c7ad75d675.pdfIn PDF document text
    • https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/wivufasabu_witiwutexufokud_bevefijepefez_zubiparaladep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fe7116031a33.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/pazirixivoxinas-gasiniwujuj-vidavo.pdfIn PDF document text
    • http://zuzutefiro.22web.org/nuance_dragon_home_free_trial.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/df1fd2cd7d821.pdfIn PDF document text
    • http://gravkamen.ru/87009569577wryx6.pdfIn PDF document text
    • https://jujokubibafa.weebly.com/uploads/1/3/4/6/134621517/30269897.pdfIn PDF document text
    • http://basiditdcf.space/residential_lease_agreement_templateu1wgo.pdfIn PDF document text
    • http://coins24h.com/67826027424bdesh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemujiv.epizy.com/audio_player_for_windows_10.pdfIn PDF document text
    • http://gevorewububew.epizy.com/77467326916.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/busekemurozanubibof.pdfIn PDF document text
    • http://nutimuratibuzur.epizy.com/basic_math_problems_worksheets.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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5528 bytes
SHA-256: a7ace3bf11e489224cf956e33cfe21cdbab970454f01a07417977fb31ab64853
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10184 bytes
SHA-256: c73bdf09cbea3f2ad73b7ad5bb9b35a0198659bf6d78ef1db92ee3209aa16acf

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