Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedd255bfd6fe42c…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 08:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe48500eb758afafa83479794e62730 SHA-1: c117747d5a3cae5e3debb30dda231ba7b2e855dd SHA-256: cedd255bfd6fe42c8dab561ba1b08f0a6a4909664bb204a6e353e4896ce39dcd
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 hosting, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://gimoguvi.ru/strik?utm_term=emerson+led+tv+turns+on+but+no+picture
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/c44d456a771ef.pdf
    • http://wegoluxetas.scienceontheweb.net/tipos_de_barbituricos.pdf
    • http://tubujefowabe.medianewsonline.com/arbitrage_international.pdf
    • http://sk-anker.ru/sefalezabalofa6prgh.pdf
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/1d74860d534ebce.pdf
    • http://atlas-copco.su/331632923075pc8r.pdf
    • http://bonboxstudio.com/tabletop_rpg_systems4wrbo.pdf
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/fc0f0410d8e.pdf
    • http://xodaxedepapopox.mygamesonline.org/quality_data_analysis.pdf
    • http://vutanojevi.iblogger.org/batch_file_programming_for_beginners.pdf
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/5fab7096cd53524.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://wozilimesiz.mypressonline.com/fidoropasopekoviwid.pdf
    • http://idealica-itufficiale.website/mosavizozeg6h8y.pdf
    • http://tobufupevujuma.mygamesonline.org/apa_style_reference_sample.pdf
    • http://tryadasert.online/netiwnx35m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mapupove.rf.gd/is_my_girlfriend_on_a_dating_app.pdf
    • http://rodobokojezaga.epizy.com/47505438488.pdf
    • http://kimawawasero.onlinewebshop.net/baixar_scribd.pdf
    • http://mokosikok.rf.gd/rumi_poem_guest_house_meaning.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f605.bin
fdbe7689062bb53e224c5ee0ba65716a604dd8154369a68ca08035c341a2b1ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5164 bytes
font_01_sfnt_off00010788.bin
8126adfa7be0d4cfb5918e875a55518f9cf60f83446941ae17a1fc952b3b3572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 11136 bytes

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