Malicious PDF — malware analysis report

Static analysis result for SHA-256 99080b9cbfcdb9a9…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 18:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aae091d643d657aebe5c19a3861b5373 SHA-1: e6f66cab73e1fddf7a8f3855f614c2bfdc29774b SHA-256: 99080b9cbfcdb9a94434f324ef37a147bb089afbf30b0e893820a5eb99cbcc77
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://soxebez.ru/award?keyword=auditor%25C3%25ADa+de+tecnolog%25C3%25ADas+y+sistemas+de+informaci%25C3%25B3n+piattini+pdf PDF link annotation
    • https://cdn.sqhk.co/mifijizudi/ihhbOHs/72787265781.pdfIn PDF document text
    • http://volalagokiva.sportsontheweb.net/bullying_definition.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/kaba_simplex_1000.pdfIn PDF document text
    • https://cdn.sqhk.co/paxabuxutujo/0hiKNgi/pottery_barn_outlet_locations_southern_california.pdfIn PDF document text
    • http://umdtheatre.ru/square_body_chevy_truckclgu9.pdfIn PDF document text
    • http://roman-holidays.shop/bamanugapezigukeriruxemi2v.pdfIn PDF document text
    • http://leomannapov.com/12999206242xcphl.pdfIn PDF document text
    • http://centerverifybadge.com/51662152420482jz.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/iZhfgfK/military_knife_game.pdfIn PDF document text
    • http://elinekici.online/todabugowibul4ybf0.pdfIn PDF document text
    • http://nowtorrentz.com/56819523631caly8.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/cqgfxRV/63117318702.pdfIn PDF document text
    • http://raisinsapp.pro/master_forge_grill_5_burnerizb43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6f1391-d51d-4c84-9215-3af67cce89c6/1880949585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa330c2a-fcbb-4811-9d88-452294537cd1/90065089276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014f61a4-00f6-4dc1-aa4b-dbd6279d2786/zevaxegijuporuzemuvasi.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/baby_trend_flex_loc_infant_car_seat_expiration_date.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_3293a3ecd7e2414bae073e855d7cdafe.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_d3bae7f1ef974fffae3fbb2f4a38969c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7099926d-9ddf-4c75-92ca-4940e1a810f4/the_seven_sins_of_memory_by_daniel_l._schacter.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5756 bytes
SHA-256: 2db933935057c8c87cfa7669037a3994b8704df6b7246fd7b950d96cb68bd1a1
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 12008 bytes
SHA-256: 6ef7613222fa130bf5ae3cea38f114facd691a5f42bee513ed2f4793cd4d4c96

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