Malicious PDF — malware analysis report

Static analysis result for SHA-256 4564d126fc6ce472…

MALICIOUS

PDF

72.4 KB Created: 2021-02-12 00:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 48320a819be9bc09f8b739aebd149f66 SHA-1: 05e590f057151e0e375b0973ab80741f7f14c0de SHA-256: 4564d126fc6ce472cca0f24ca834e37fef1d786776ba96b75c8506b24522cc06
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF viewers to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=sanshiro+sugata+livro+pdf PDF link annotation
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/wudadejidafajejul.pdfIn PDF document text
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/tusigoworudes.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/molemegozafadet.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/lawez.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/157499d996da.pdfIn PDF document text
    • http://pumutug.iblogger.org/acura_rdx_2014_review_consumer_reports.pdfIn PDF document text
    • http://gomuleg.22web.org/holiday_office_party_flyer_template_free.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/5825229c5eb.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/viladil.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/vukuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_600a55b2f0efc.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/resufowoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dadixuxizu.rf.gd/carnatic_music_app.pdfIn PDF document text
    • http://ponusiniwanus.epizy.com/9972658907.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/sociologija_religije_hamilton.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/xurivulonofanusefis.pdfIn PDF document text
    • http://wurasegato.rf.gd/cg_comedy_hd.pdfIn PDF document text
    • http://rakejobik.epizy.com/25141249060.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 5468 bytes
SHA-256: f6e09a32afe1de52909085dd5b703028d0e535f36f3a792eed625ef8b8495169
font_01_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10796 bytes
SHA-256: a572c6b29cff122bbc345f77dab143893003c092ec1529f8847c9e91e07dcd5f

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