Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0ea81b9e14781d…

MALICIOUS

PDF

81.9 KB Created: 2021-05-15 11:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 261a2cf6239b11641a200afe7f620466 SHA-1: 2f9b9b07d1fd6390080846e804556252d2deec26 SHA-256: cf0ea81b9e14781d5ea13519459398f01ebf9872ccfa3540b0357239e92b7ae9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

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
  • 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://resalured.ru/strik?utm_term=example+of+problem+and+solution+text PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418567/normal_60651948a2126.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/10191840947.pdfIn PDF document text
    • http://yourbigdick.space/is_the_stock_market_on_a_bubblea6rqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6038d62d5e1eb.pdfIn PDF document text
    • http://gatorama.space/rigumuneluwuvovep01x7l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fe1807048388.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/buku_islam_dan_budaya_jawa.pdfIn PDF document text
    • http://marafonsport.site/86727225703c1m4r.pdfIn PDF document text
    • http://believes.space/associate_android_developerb7f8x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/corporate_philanthropy_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634759d7-7e6d-4963-957a-4282d29a7ccf/31683243808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f93302-55e8-4691-87db-21f99404b346/91084985101.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_0e07fc508bd249c6b50cbdde3e579780.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_5d5af56408b74b548680bcf03e17d0fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d6c31d-477e-4da7-97eb-1bd64db4270c/90439486556.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_b89841c3497f4f169179f7c8d298c2cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f866cfb0-489c-4ae1-9deb-dbdbace87717/how_many_quarts_of_transmission_fluid_does_a_2012_chevy_impala_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aba3bb-f81c-4801-a1e9-ccfab006a735/what_is_burger_kings_vegetarian_burger_made_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f450978-3075-4fdd-ba52-1ee167357a09/cant_see_out_of_my_celestron_telescope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a87855b-bb2a-49aa-82bd-7edd78d03d47/what_is_the_best_cva_muzzleloader.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_f97a576c840747f9a95cc5d4ae8c12f6.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_86227481007f4537a57f10f0c017815e.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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 5352 bytes
SHA-256: c0073c17c9185f99629369667cad458a26db10055d2589d9bf068151a4928b69
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10940 bytes
SHA-256: 9b9018eec568218b60623f6a1a5a0dbe06b70a1acd41443528e3d7ac08cd948c