Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b999cf4bc32ec94…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 17:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bcc5def08f1309c076241da78b3d3ac4 SHA-1: 589b792669562bb15f9ae532b0656a16a05f8f48 SHA-256: 5b999cf4bc32ec949fc129f19cf1a370408d23856dcdfa12855fe91556db3d2f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results or distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and link farm nature suggest an attempt to redirect the user to a malicious site, potentially for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=countries+and+nationalities+worksheets+printable In PDF document text
    • http://wipunemobak.mygamesonline.org/gawifefokexajopitajupig.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/ccca4.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/gabagevisasivef_bixefebile_kesisuvimuv_judipulewa.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/171ef4e50dca0d.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/zideliso.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/kunujev.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/lafabebelati_fuvofu_lowev.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/annexure_c_for_pan_card.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418570/normal_5fcdc61fa41e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_60340937d9b72.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/wokitemafuruwibew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_60033fa1f28d1.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/pewufijitudanususu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_6042c321ac848.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/ninisusiduzaxerusawubem.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/ramamuzurujij.pdfIn PDF document text
    • https://jenogisemelo.weebly.com/uploads/1/3/2/3/132303080/kakosisumigumudal.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/tubupejevomo/call_of_duty_mobile_gameplay_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/ley_de_blanqueo_de_capitales.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_e1d1d2ea25384a0a9f5ea9b9d67d0a37.pdf?index=trueIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_bf237685337d4e70bf55dd7833cd4095.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5248 bytes
SHA-256: 4dc4aa780eecc8e4006b0165af68b6b32c5017cec11e3f49cf1ea03e0f7edb82
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 12764 bytes
SHA-256: 9b86e6f1b042a760f4a023ff3b97a18fb58e92bd2d617d58b68c084ad30b70ea

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