Malicious PDF — malware analysis report

Static analysis result for SHA-256 4355e6afc5e63b86…

MALICIOUS

PDF

108.4 KB Created: 2021-03-16 17:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f2b21f1af66dbe59c5ed8b1e5c03d4be SHA-1: 3ec542d80e603f4de2cdc870233814965234f3fa SHA-256: 4355e6afc5e63b861bff6d4e214e974de95026ff1700f7d2cb8e777d0fbcff00
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/wix?keyword=adaptations+worksheet+7th+grade PDF link annotation
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/filapaputo.pdfIn PDF document text
    • http://qlemelest.online/valoliwac1g82.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/RhfP109/61266148302.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/divuv.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/ghibXXt/616656232.pdfIn PDF document text
    • http://mnatural.space/crowdfunding_campaign_promotionmp5ql.pdfIn PDF document text
    • http://bullbananavannaone.xyz/55966432686mcg3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_604b16205fd35.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/1ttijih/fibuwamabetetujavesesivo.pdfIn PDF document text
    • http://tk-pobeda.site/3062101625ivxw8.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/misatigelotodejelaxase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_601c8d6f55f53.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/aggia4s/18998717672.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/nPidUhe/wesoloduvarivoxatatuneze.pdfIn PDF document text
    • http://center-san.ru/excellent_meme_comradekql19.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/62172386792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomizawok.epizy.com/cuantos_centimetros_hay_en_1_metro.pdfIn PDF document text
    • http://zubeleboju.epizy.com/windows_10_professional_activator.pdfIn PDF document text
    • http://limixawur.rf.gd/ti_nspire_cx_cas_games.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/84148980276.pdfIn PDF document text
    • http://wagivuxofoz.rf.gd/14924251385.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/byzantine_art_in_the_making.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/counseling_theories_and_techniques_summary.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/comida_criolla_recetas.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_off00016b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B89 5416 bytes
SHA-256: ee5af2205c0d5e36187f08be8230268014e63d97767274c4b60b35b91fe935e3
font_01_sfnt_off00017e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0B 11408 bytes
SHA-256: ae5a2c7165dc143fa41dded4bf2543e8e27b3bc61a2ebc50e2dd1ed247c53645

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