Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4234b8a08214e99…

MALICIOUS

PDF

73.5 KB Created: 2021-01-19 16:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d767064461f960a3cc1470ca21c2fbab SHA-1: c53f6e1415f15cf73299f9e1c2d0493dc822369d SHA-256: c4234b8a08214e99518d6a4d40105d641905d1cf2e2755c4e84cac462c074daa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Expanse season 4 episode 6 cast', aiming to deceive users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wb?keyword=expanse%20season%204%20episode%206%20cast PDF link annotation
    • https://site-1194091.mozfiles.com/files/1194091/vumagokajuzelizusex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5fe74f2e891ee.pdfIn PDF document text
    • https://site-1218116.mozfiles.com/files/1218116/bujovavupujalotel.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/jelevabexolo.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/toropeduzutu_tajudegimizuza_xatafofade_fidusuziloxigur.pdfIn PDF document text
    • https://site-1180710.mozfiles.com/files/1180710/maternity_leave_letter_template_ontario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9a1368e5695.pdfIn PDF document text
    • https://site-1084296.mozfiles.com/files/1084296/word_blocksatz_mit_automatischer_silbentrennung.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/the_tiger_king_movie.pdfIn PDF document text
    • https://site-1168155.mozfiles.com/files/1168155/bandeya_female_ringtone.pdfIn PDF document text
    • https://site-1178309.mozfiles.com/files/1178309/android_cheap_phones_philippines.pdfIn PDF document text
    • https://site-1178373.mozfiles.com/files/1178373/pixel_battleground_mod_apk.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/real_racing_3_hack_apk_download_ios.pdfIn PDF document text
    • https://site-1174809.mozfiles.com/files/1174809/towadexazivesofoxovepo.pdfIn PDF document text
    • https://site-1179767.mozfiles.com/files/1179767/sanifusojiroxurepo.pdfIn PDF document text
    • https://site-1193440.mozfiles.com/files/1193440/servervariables_remote_addr_returns_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8cf0f4d2d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5fb5e6c5eab06.pdfIn PDF document text
    • https://site-1171417.mozfiles.com/files/1171417/29020961593.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/17c3b9.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/vabemavuputenif/xinofugeresikukusugawiso.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/fusionner_deux_documents_en_un.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/marathonloper_abdelkader_benali.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 5208 bytes
SHA-256: 8ee8c7cfba55e2e51c995f5af480ae33f72ef3db78e269637c771d509efc6104
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10516 bytes
SHA-256: 9cf7e97d889d0ee1067e2caf2a0bc9673762af00134f5625f745b94311b78d0e