Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c2072cc1d97e72…

MALICIOUS

PDF

75.9 KB Created: 2021-05-03 00:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4e424b73ebfd424baf33d7ed121d2ad SHA-1: e86cbd267dc4caadc0a091f3b7543e15d3165286 SHA-256: 11c2072cc1d97e7294dbcca137c16e3bb8fce1b8cacdbafcb2a1e783485265b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous embedded URLs, several of which point to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=active+and+passive+voice+exercises+for+class+10+pdf PDF link annotation
    • http://kogikisarazomel.22web.org/4241479797.pdfIn PDF document text
    • http://shtangye.xyz/tezoxa1thmq.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/hgc74jg/poxiwokor.pdfIn PDF document text
    • http://civiliscmq.online/79816625869piwb7.pdfIn PDF document text
    • http://wekeb.space/duwirndgb8.pdfIn PDF document text
    • http://matcobzor.ru/87754998792cdn9b.pdfIn PDF document text
    • http://temppicture.xyz/32585647436lfpgu.pdfIn PDF document text
    • http://vovadot.22web.org/jimuxidokuvejusagajetej.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/bicgiY3/32835829082.pdfIn PDF document text
    • http://gewugonuwo.iblogger.org/plot_diagram_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/dfibxgi/dofawevuragavapos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf62ec5-e522-417b-b3f0-b6e9a7ed6244/19502526922.pdfIn PDF document text
    • http://mowesod.epizy.com/1372271940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97c4a2e-8bf8-44b9-bbfd-8079b79e187c/10126609423.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/bright_starts_nemo_bouncer_assembly.pdfIn PDF document text
    • http://duginufolos.rf.gd/66880586281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1cdfc0-5a2e-4da2-a4c0-39e4511602c2/betezasoresuzeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287131a9-fdc8-4ac8-ae67-2c2c8808a3b1/proper_way_to_clean_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cf1f0e-035e-4b61-bda0-b76b9411ae53/wikapolidarerakisifubisa.pdfIn PDF document text
    • http://xutirekivob.rf.gd/metformina_850_mg_efectos_adversos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c37c88-3577-4bc2-924e-cd8bc8d54a6f/46096659718.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_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 5460 bytes
SHA-256: 130b9354f59dec8157f43e561df116440759e438a5c35a137b3b0909bb92b0d4
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10452 bytes
SHA-256: 018bf6a283979d4e34957c8ca55909ade52359ce1fc634e34b81fa79897dac31

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