Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21134e1dcd91dc2…

MALICIOUS

PDF

74.8 KB Created: 2021-06-04 00:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 299f8697bf39479df58e6cec87b496af SHA-1: dd4d550e1296a159e089fbaa71294f1a4e95fd06 SHA-256: e21134e1dcd91dc2682761a7cf1b50c931856cbf2198e87550e91ba2ecf7e98b
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. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/gekazuvewaza_pomirusopa_gakiku_nimupoka.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://pixomot.ru/pbw?utm_term=google+drive+unlimited+storage+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483602/normal_60663f73b69e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_6012872937bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_6036c0457aa14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_600bfbf49182b.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/gekazuvewaza_pomirusopa_gakiku_nimupoka.pdfIn PDF document text
    • https://zupuraba.weebly.com/uploads/1/3/5/3/135348036/399008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6048396a901f2.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/pazozavud.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/vukojiwosivil.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/8610617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465707/normal_5ff2caad3f5ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedidovetaw.pbworks.com/f/wisupura.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144506484/autocad_2007_crack_dll_files.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/95380711781.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/pivujovodibejugemi.pdfIn PDF document text
    • http://nowefuro.pbworks.com/w/file/fetch/144413658/14163958611.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/how_to_get_orenetchi_my_tamagotchi_forever.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144515718/download_gogo_live_mod_apk_new_version.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425397/presidents_choice_5_cup_coffee_maker_manual.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144563169/baldis_basics_gameplay_no_commentary.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/85857070416.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144577884/nazoj.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/gexavefuxasaneg.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144466689/maine_coon_cat_for_sale_in_malaysia.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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 5436 bytes
SHA-256: e3316748fb3322b5e20b2dcaaa40d56920b1014c32c4d611fd5eb52563c84e94
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11220 bytes
SHA-256: 9e1d402e41f150bdbf370f3103493bd586c50a45e5ea3044b207c75cd1bdbdff