Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c4eb81e844cc14…

MALICIOUS

PDF

102.6 KB Created: 2021-04-01 21:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8428d028d8c22eca910a932823f70f32 SHA-1: 7be1f762116607a6ad6fa92e9643973a611925da SHA-256: 89c4eb81e844cc14dbc9651f6341a25e48f6cc7ff956c3a9d6d70a2cac9a6867
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=estudio+de+caso+clinico+psicologico+ejemplo
    • http://sepoxudozixo.sportsontheweb.net/the_bluebook_a_uniform_system_of_citation_20th_edition.pdf
    • http://graatorama.space/garmin_g6_approach_updates4ttzu.pdf
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/2774164.pdf
    • http://shoppingyxplus.xyz/tutarijilodajex0u1ld.pdf
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fe1c9caeb0f0.pdf
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/2883468.pdf
    • https://cdn-cms.f-static.net/uploads/4390663/normal_602b8877c0659.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/xofaxunolutama_fivozagetejifal_puridavumataj.pdf
    • http://helplnstagramcontact6088756.com/75301333438or3kq.pdf
    • http://remontnatali.ru/how_to_get_your_gun_permit_in_massachusettsx02fl.pdf
    • http://googsnat.space/bridge_construction_simulator_mod_apk_unlimited_moneynmy58.pdf
    • https://static.s123-cdn-static.com/uploads/4449769/normal_600986a4cc74f.pdf
    • https://vaxawoma.weebly.com/uploads/1/3/4/7/134745114/xojaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/falufusu/windows_10_bootable_usb_free.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/fishing_hook_tying_machine.pdf
    • https://s3.amazonaws.com/gebukil/20845528024.pdf
    • https://s3.amazonaws.com/fezenur/guided_pathways_dcccd.pdf
    • http://memamawu.onlinewebshop.net/gokutitikiradujex.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e7a.bin
c657ee3a6d084e08d4bcb6def4c0df1004ef222015ec8b5013c3a09db402b801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7A 5328 bytes
font_01_sfnt_off00015093.bin
3b3ffa709a86ad53f34e84e00f42a66da399784ae1cc4473b5bb4d62f14975b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15093 11148 bytes
font_02_sfnt_off0001757b.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1757B 16204 bytes

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