Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3a0868018937b9…

MALICIOUS

PDF

81.8 KB Created: 2021-05-02 12:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aa11119de485728b898b83c5e79dd6e7 SHA-1: 95c46ab686859ae2ece29fec35edea65f98c4583 SHA-256: ba3a0868018937b99411d63647672412a6b48cc8764a766e3d31d98d8d213d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://vilenefex.ru/strik', is likely intended to host or redirect to malicious content. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to exploit vulnerabilities or deliver further payloads, aligning with common phishing and malware distribution tactics.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=themes+of+contemporary+art+visual+art+after+1980 PDF link annotation
    • http://perevod24-card2card.site/lol_camille_jungle_guidejrzxh.pdfIn PDF document text
    • http://banquepopulaire-fr.org/casio_solar_watch_not_charginghgjeq.pdfIn PDF document text
    • http://santaparker.store/minecraft_pe_seed_kodlarq3f8j.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/rudaratikazix_gowanaxotubowa.pdfIn PDF document text
    • http://meetsoda.pro/what_to_post_for_social_media_marketingsr8s7.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/ef19895c.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/9764461.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/8204535.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/zupoxepenutifa.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/2939076.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/tejuvonixag/china_guangzhou_shopping_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/19731711618.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/coliforms_present_in_well_water.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_69180236a37c4657a825162959126472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/connotative_and_denotative_meaning_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/email_information_commissioner_s_office.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/49731293942.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/short_vowel_sounds_worksheets_3rd_grade.pdfIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_1c9dd4c5318b43d2b671a1dfd79ff725.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_d2d50c40148f43a99c69a0ff362d3001.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_114a132417884b9982e856058ff84bea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/i_ll_fly_away_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/94075284667.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_9330dc0bac19496eb7cece741216aafa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mufukep/english_grammar_level_test_with_answers.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_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 5908 bytes
SHA-256: ebefdf607fc7d961e49e9643be969e1f95e09d1d1e320ccc325273c8f8dc58a0
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 10828 bytes
SHA-256: a8002fd78e0dffcf79ab73b96b71d7b6e0212dc924d599549b3b36c7e15ed8d3