Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a258bec48b231…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 17:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b33ed461a8533f07beb9d20afb0a4f59 SHA-1: a4576114fb7a04bde456b615ef1877da88d7862a SHA-256: bf1a258bec48b231049c0311cfb51b85a2d53fd1ac415af7e6052cc3d17ceb92
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to a malicious site, possibly for credential harvesting or further payload delivery.

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 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://druttle.ru/award?keyword=shipping+container+house+floor+plans+pdf PDF link annotation
    • http://form-lnstagramcopyrightservice.com/27815310218pga55.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/tutijekajin-fodaxawejog-pitenodomugo-fadobifuxuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_600ea66c5240e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_60200188cb7e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60434fda7568f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fe5e0bc8a02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_5fd330789f335.pdfIn PDF document text
    • https://maraduwiz.weebly.com/uploads/1/3/4/3/134363873/a2d102f89d2ae.pdfIn PDF document text
    • http://winsbig.space/985998586377uqud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5e0a3bad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414331/normal_5fc5bafa67efa.pdfIn PDF document text
    • http://sis-paypal.com/639304139nb6al.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_604e6a8be29da.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/4860595.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/timeziso/25764698036.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/jenisebopexejikojog.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/how_to_be_miserable_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/5_year_plan_template_career.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/boxubavowajibozemofere.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/10200178431.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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5520 bytes
SHA-256: f129e19c7b15065b0f742f72e39090fc87a4c36eebbdc4acfb0ae30e93f88a86
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 11204 bytes
SHA-256: ee3e5521116d356f3a8f991f3830503b05c26f99d034a5cab7cd8142198e40ff

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