Malicious PDF — malware analysis report

Static analysis result for SHA-256 252e42c759867cf7…

MALICIOUS

PDF

84.1 KB Created: 2021-04-05 15:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 30e1ba12f04e57f0625258b36d20558d SHA-1: 216165783a94726ff2021a5944c0509b0737f694 SHA-256: 252e42c759867cf7125580566be94385eb05ccb839a3789b5b2c29cb311a8ce5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of URLs like https://mezovuduw.ru/strik?utm_term=ultimate+mortal+kombat+3+sega+saturn indicate a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=ultimate+mortal+kombat+3+sega+saturn PDF link annotation
    • http://farozemirig.scienceontheweb.net/celestial_tarot.pdfIn PDF document text
    • http://b2b-servis.ru/katosozogegejuz4f1nx.pdfIn PDF document text
    • http://zofugef.mypressonline.com/60976578762.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/2009_mini_cooper_s_service_manualg1eiq.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/ayatul_kursi_with_urdu_translation.pdfIn PDF document text
    • http://drilltech.info/50173132737koqjz.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/angina_treatment.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/barrenacion_a_diamante.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/essentials_of_assessing_preventing_and_overcoming_reading_difficulties.pdfIn PDF document text
    • http://filmera.ru/how_to_make_a_paper_crane_step_by_step_instructionsadjhc.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/excel_formulas_not_updating_automatically_2010.pdfIn PDF document text
    • http://turistik-a.ru/you_are_god_alone_lyrics_and_chords_key_of_glno2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_f3d1841def3146c78ebe2b4a39f12f46.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_555022c04ae64218b018e8000c538edb.pdf?index=trueIn PDF document text
    • http://rabelinowizufe.myartsonline.com/joint_venture_agreement_example.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_6b91f3f927b3450cbd761b55d8fbbddb.pdf?index=trueIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/ielts_reading_recent_actual_tests_vol_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/vanilla_wow_hunter_guide.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_333f235c894c4f6ca9326f87aaf8be40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/bootstrap_4_form_validation_ajax_submit.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_ba99802576b74632ac786aa6a33a8a60.pdf?index=trueIn 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_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 5364 bytes
SHA-256: 83ef7b7f089037171d6719eba69477c2cc3e1bbe4b85bc1469646b9c53948d3b
font_01_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 10816 bytes
SHA-256: fa46d50c0fd00ade0788ce2c3b0da209b85067ee5a58f30addcc2f775c3caabc

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