Malicious PDF — malware analysis report

Static analysis result for SHA-256 131b73a23926398d…

MALICIOUS

PDF

80.3 KB Created: 2021-04-08 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 23b5f9478847557f136776f4abaa3a1a SHA-1: 1f87fbcaf460e9a1ee57aedb7a48e236bbec0d68 SHA-256: 131b73a23926398dacb3c5b30c3ca9bdf7cbea36d560e366e8b5081fcf854e9e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a common technique for distributing malware or conducting phishing attacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support the malicious nature of the file. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://seumenha.ru/strik?utm_term=festivals+of+pakistan+2020 PDF link annotation
    • http://tezoxefakalexo.sportsontheweb.net/nenakagimojapofokakudaseg.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/rovulose.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/calendario_2020_colombia_para_imprimir.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/how_to_get_maytag_bravos_error_codes.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/acetic_acid_manufacturing_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378855/normal_5ff6b4c37a986.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/simple_conical_projection_with_one_standard_parallel.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/9e6b180776e.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/michael_crichton_dragon_teeth.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/xesemuxomafowipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_604ce6947c202.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/rozekapexonakim.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/when_does_forever_evil_take_place.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_604342cb45f12.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/jifedefujodu/rte_tv_guide_listings.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/after_effects_cs5_templates_free_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/balancing_redox_reactions_practice_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/jevamitalazovejef.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/safety_data_sheet_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/75643209996.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/catholic_answers_eastern_catholicism.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/border_film_all_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/mmana-gal_basic.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/wisaruwenadazojemaz.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_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 5152 bytes
SHA-256: 83414b73e8bbeda292d167f690987e5d6d9c063e2bf0d02d3a20f599307f7783
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 11360 bytes
SHA-256: e7217e7d29294466f73dac4ea326216df54943ec9338ecb90e3c75e834999fd2

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