Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3e4e9948a1aebf…

MALICIOUS

PDF

81.1 KB Created: 2021-04-08 09:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c68a65075500d54809ba9417a9aba5e SHA-1: 2254502e03ce4add6caf0cacdd1ac7847211bf0e SHA-256: af3e4e9948a1aebf1a0d9ecda29663e217ad7951c6a52359b639380bfc7bffa0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on external services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests the PDF itself is designed to redirect users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=nutella+toast+nutritional+information
    • https://tenivutod.weebly.com/uploads/1/3/1/0/131070705/4c07f.pdf
    • https://bijararavi.weebly.com/uploads/1/3/4/5/134587429/falijeke_pofov_volumekuled_pupumen.pdf
    • http://gibelineg.sportsontheweb.net/junopulora.pdf
    • http://xafawotilujos.mypressonline.com/compuestos_inorganicos_de_la_celula.pdf
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/mofos-kavefasagekava-gefoxozivuwoluk.pdf
    • http://penafur.scienceontheweb.net/functional_requirements_template.pdf
    • https://cdn.sqhk.co/zujijivopuju/pEKjbnE/3422864938.pdf
    • https://cdn.sqhk.co/rokogikapo/iiDhj5n/gokijapexapavogife.pdf
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/jebuti.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/vokozufanuv-sasemixozelugo-mizipewu-vivazadiwurovil.pdf
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/lezinobibodu.pdf
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/b82c2504.pdf
    • https://cdn.sqhk.co/kosenopelid/ghgcgei/nfl_network_on_spectrum_channel.pdf
    • http://wuwudikosegukem.mypressonline.com/acls_2020_espaol_descargar_gratis.pdf
    • https://cdn.sqhk.co/tilekixu/ejfji5Z/bomegajefenefafexuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d80242e8-f55b-4a92-8733-6db008e86092/what_is_anova_table_in_statistics.pdf
    • https://uploads.strikinglycdn.com/files/017d73a8-40c6-4233-acf5-c3ef495c81fd/there_are_no_logon_servers_available_windows_10_fix.pdf
    • https://uploads.strikinglycdn.com/files/01628d50-4c17-49ee-8d55-c8652b6e72e3/dupokiriru.pdf
    • https://uploads.strikinglycdn.com/files/5d6ca310-9c3e-4d34-a4e9-96622b43210f/88071632947.pdf
    • https://uploads.strikinglycdn.com/files/c9fcb5ae-f586-4ef0-9126-414f1049daac/black_and_decker_grass_hog_18v_string_replacement.pdf
    • https://uploads.strikinglycdn.com/files/61211281-5093-4f8b-b76c-aa9b35b5bf4c/what_does_freely_chosen_self_directed_play_look_like.pdf
    • https://uploads.strikinglycdn.com/files/5c82b3cb-ad65-45ad-b05f-20bc54dda170/wexazotabasutumit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd93.bin
b6354a3b8ac5c16014466f9cb917d13431a1635694cabac8af59d246afb3938d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 4884 bytes
font_01_sfnt_off00010e17.bin
2e26543293371b11103c39c891713d0bb7b6c2a8c419313d2f4e21c81c864934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 12284 bytes

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