Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3e9c144bd12a28…

MALICIOUS

PDF

76.7 KB Created: 2021-04-16 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8a6de4eea0aacf4e120eb9ec865b2c2 SHA-1: 794ca0a57de9fa31d2f937bf28cb6f9b196e0b9c SHA-256: ee3e9c144bd12a2815208ee0a114bd419745b908b2d3d1c2e8cea7e09101665d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly support this attack pattern.

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://pelibifir.ru/strik?utm_term=cat+eye+velo+7+installation PDF link annotation
    • https://cdn.sqhk.co/kifuzopeko/hcLii72/insideout_wellness_wenham.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/72917066132h4r5b.pdfIn PDF document text
    • http://rapukenafep.22web.org/21431846365.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/gpsjd45/31721276604.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/hhdhjCy/foduwodo.pdfIn PDF document text
    • http://tevopose.66ghz.com/manually_update_windows_10_october_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/YvuVIge/five_nights_at_freddy_s_game_unblocked_76.pdfIn PDF document text
    • http://renakuw.iblogger.org/probability_of_simple_events_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/icjhjem/12023531525.pdfIn PDF document text
    • http://static-get.top/beautiful_background_picnbxvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://woxowezev.rf.gd/vuduve.pdfIn PDF document text
    • http://xewaxal.epizy.com/balance_druid_pvp_guide_wowhead.pdfIn PDF document text
    • http://zatejufeg.rf.gd/vukozog.pdfIn PDF document text
    • http://tuwafexom.epizy.com/concepto_de_normalidad_y_anormalidad_en_psicologia.pdfIn PDF document text
    • http://donoguxi.rf.gd/basic_of_c_programming_language.pdfIn PDF document text
    • http://dusitabupev.rf.gd/uba_aptitude_test_past_questions.pdfIn PDF document text
    • http://wuzugimekiwetad.epizy.com/47325933577.pdfIn PDF document text
    • http://negifunowulag.rf.gd/15383818972.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 4636 bytes
SHA-256: 6aad41f0bffa9cf9a481c0b9030bcdcd789a4533c84c2ba5613f6ac11f4274c7
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10756 bytes
SHA-256: df9c956cf44647aed1f75e7f3b49306c220582a06900b3d3852caf800e7ae6cf
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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