Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80420dffda9a6bb…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 22:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5453fcc333acdbc9d3df5d3519b022a4 SHA-1: 2673f66a96216807b1b0ceb6c1ff73dd838b0e2a SHA-256: b80420dffda9a6bb616089da70fc875a397e6e84c31d2dc7ff71ab1bb52d548d
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 redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URL 'https://mezovuduw.ru/strik?utm_term=crown+of+midnight+vk+audiobook' is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://mezovuduw.ru/strik?utm_term=crown+of+midnight+vk+audiobook PDF link annotation
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/8732607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494436/normal_5fefcc714ec22.pdfIn PDF document text
    • http://wurikiwerofa.getenjoyment.net/18005284402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fd03ea970c59.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/zesufutix-worofatafeji-saleje-jisojezifo.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/nipowubumotetafikovigif.pdfIn PDF document text
    • https://bafalado.weebly.com/uploads/1/3/4/8/134865771/1862055407a2.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/monorinunogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_601606cf492e8.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/supernatural_cast_season_13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_60340ea2c89b3.pdfIn PDF document text
    • https://fomodefoz.weebly.com/uploads/1/3/5/9/135958111/rogutapisor.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/bactrocera_cucurbitae.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/fajixe/66444763720.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_ae65c58480844d9fb2cc12176cae1935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/creature_movie_audio_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6c66ef-599d-422b-bc74-0ad6173d080a/vutulivekuburavatazoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cb1efa-03f6-484a-82c1-d83093366708/nikon_coolpix_s220_camera_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f500156-08d3-4f96-9b25-b701358ecbff/how_do_i_use_my_masterbuilt_sportsman_elite_smoker.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/b_i_h_a_r_full_form.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_d06e8b49e5764f03b261396334c31a3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/41751323713.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_7da8938af5e44c3a8e6f224de5503b06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68709eb1-a8ed-4e28-88c3-538c6740e3b9/graphic_designer_portfolio_templates_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/4402031688.pdfIn PDF document text
    • https://86cafecd-0af7-43e6-b578-14605c742a6c.filesusr.com/ugd/c4ddd0_e5d84b46eb384a759051230e1eb36ed8.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_38bb01e6ba824e6e9bc8793778c6549c.pdf?index=trueIn PDF document text
    • http://gemawinikifiv.myartsonline.com/libro_rejuvenece_tu_cerebro_gratis.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_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 5372 bytes
SHA-256: 73346103d300ff39feab62a9ded27f8a9bbf8d35ff84977028d7547257d400dc
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 12132 bytes
SHA-256: 4755123978f78ed70794395b072f443cd7c88e3241853bd94340a611a27b456c

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