Malicious PDF — malware analysis report

Static analysis result for SHA-256 452eef50ee1b82f1…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 05:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f412ef92ea71e0f4c92ed766487d459 SHA-1: 04ff05b15489fcda36a26452ac55f9b25f63ff1c SHA-256: 452eef50ee1b82f102ed00fe8dcb14527c006088f1bba5cc758bbda46d3b89f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by identifying a link farm on disposable hosting.

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://jacksth.ru/wix?keyword=pathfinder+bandages+of+rapid+recovery PDF link annotation
    • http://vutisonoj.sportsontheweb.net/autocad_import_not_showing.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/asian_games_2020_medal_table_download.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/brian_weiss_libros_los_milagros_existen.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/7972980848.pdfIn PDF document text
    • http://mediaverifiedbadge.com/104787922168296o.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/48895139179.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/kabikarudogopepifobubaw.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/denewa.pdfIn PDF document text
    • http://help-service-support.com/368214242939xiy4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segimoto.myartsonline.com/basic_questions_and_answers_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/guzesevapobujizobo.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/total_body_works_5000_exercise_chart.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_0850094d45974ca6b565b8b377639dea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kigavanus/sitonixik.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/amsterdam_mappa.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_e565aad3a1b547718ac5b6636e5d0871.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 5688 bytes
SHA-256: 06876f41e5221cbf5e9a3fc928d06f2c86bb4146e347b52f031883624153054f
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10064 bytes
SHA-256: 50f000654c683755e9f1520ad88e4c0ba0e7080db0b3b67127901216fef5f77f

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