Malicious PDF — malware analysis report

Static analysis result for SHA-256 11148a44227676f7…

MALICIOUS

PDF

59.9 KB Created: 2021-02-17 10:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1aafdbe7bc12f3cc5deb7daa889e7692 SHA-1: 9cfc06f4c95f3611ff2e2793a39572c52ec434e9 SHA-256: 11148a44227676f70d86fd5812c53fef152ca269ee60c3f80d9a1a001716f3aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified by ClamAV as 'Pdf.Phishing.Trojan'. The embedded URL 'https://baarspo.ru/123?utm_term=homestuck+book+1' suggests a lure to a malicious website. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=homestuck+book+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5ffeb4520ecbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5fcdc12d51106.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/3120774.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/jupututuzoban-telikidufujif.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/e42898166a.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/afmc_question_paper_2018_bangladesh.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/81389228843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fe77fc6ded0d.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/rufonali/13549238589.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/free_sheet_music_careless_whisper_alto_sax.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/iqiyi_inc_earnings_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/45071301795.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/nafta_certificate_of_origin_template_2018.pdfIn PDF document text
    • http://veruzixiki.rf.gd/funeral_cover_application_form_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/zelijirupumawurojixapowov.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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 4824 bytes
SHA-256: cd29665dec6ae9fd580234eb194893f0ffb31a140df90b8cfd6814505dea6678
font_01_sfnt_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 9748 bytes
SHA-256: 91112589771e625c20669bf255ca79ec4048cc7b26bb420cf12dfb6f1376401a

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