Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fe6cecdab21c16…

MALICIOUS

PDF

73.0 KB Created: 2021-03-06 23:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ac143061073dc6a43095c4de4b31af6 SHA-1: fa2db1efc49878b3547eb464b2fbf0b2ba528408 SHA-256: f3fe6cecdab21c16348fe0bad73a94be71c04dad17e43dc7120a18591d336cc5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm designed to obscure malicious destinations.

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://jacksth.ru/strik?utm_term=how+to+glaze+a+fully+cooked+spiral+ham PDF link annotation
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/legubaroxerizat_mazefapumodufin.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/xizadetebe.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/dibujuwunusel.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/games_like_nancy_drew_on_steam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fe07f6eb4699.pdfIn PDF document text
    • http://watogoda.mypressonline.com/hill_rom_900_bed_price.pdfIn PDF document text
    • http://podcard2020.site/3080858255896wb7.pdfIn PDF document text
    • http://mazers.fun/95447842226b9cp0.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/tagotodewijevefut.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/what_is_moultrie_news.pdfIn PDF document text
    • http://zatoboyvibor.fun/communicate_with_your_spirit_guide0ielq.pdfIn PDF document text
    • http://luminar3-download.xyz/433874541300y3xi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fe255d534a02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_6002dd930da85.pdfIn PDF document text
    • http://olivamebel.com/fichas_de_comprension_lectora_para_segundo_grado_para_imprimir6m5ye.pdfIn PDF document text
    • http://raisinshub.pro/english_speaking_app_for_pc_free_downloadhz7zq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_60258733d1aa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixarewujedel.atwebpages.com/89816725488.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/physiology_of_behaviour_carlson_12th_edition.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5836 bytes
SHA-256: 6c5ad136d50c6e3ab9ec584001bbe237bd62478ec32b6c88f82786bb6346c96d
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10452 bytes
SHA-256: b514c0bed47f3c6bf1bafe6531768920032ba6df948afd45115bb42535254fcf

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