Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9575633d26665b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-22 18:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9332e31f61a81b69558cc225ea99952d SHA-1: 5d3e47795f936054f9cd43333718fa1a64abae2e SHA-256: ea9575633d26665b28b5b5219260ff80d1cfda074640d916a5c11a6005a038ff
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that serves as a lure to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=why+does+my+rca+sound+bar+keep+cutting+out PDF link annotation
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/rovejofapozigumoza.pdfIn PDF document text
    • http://smartcreditcheck.info/how_to_start_victa_mowerfpqlg.pdfIn PDF document text
    • http://soldonlittleton.com/crib_sheet_emily_oster_waterstonesfvu8p.pdfIn PDF document text
    • http://chelobaka.space/314735202003bpuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fd64cdb8bd4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_600cfa5271b5c.pdfIn PDF document text
    • http://hushseo.online/world_history_book_freekgdz9.pdfIn PDF document text
    • http://tricitysikhs.com/kinds_of_weather_worksheet_for_grade_3buisk.pdfIn PDF document text
    • http://fsbsiod.com/71045789603wudsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_602c0d73bbb62.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/minecraft_14.0_cepte_neth6d2h.pdfIn PDF document text
    • http://ttop-shop.com/how_to_play_no_rules_fifa_21_onlinebeiv7.pdfIn PDF document text
    • http://sfr-webmail.com/boat_racing_games_free_downloadmb8o4.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/zufaxepixiguxax/95086521959.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/circular_waveguide_attenuation_below_cutoff.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/pepuranaloxexazamosevipuf.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/afars_appendix_ee.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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5776 bytes
SHA-256: 215ebb5bfa2e216745608a403e6ee99e5f20b59086c2e54e2fb92efa6a9030eb
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10816 bytes
SHA-256: e4edf3802ca2cf2fa989cd582fd9084b130414c96d6c775628f829f77d44b79c

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