Malicious PDF — malware analysis report

Static analysis result for SHA-256 41251481e8ecfcf3…

MALICIOUS

PDF

79.9 KB Created: 2021-05-05 02:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5878cc761147585122f0221027b6f92 SHA-1: 7f40a25638d872a1acb6c66ab2231df154e03998 SHA-256: 41251481e8ecfcf39117c6e4e46ced9158a0d47b51a2feef9f0326ef92ceaf15
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary suspicious URL being https://botokaw.ru/strik?utm_term=yaesu+ftdx+1200+audio+settings, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Yaesu ftdx 1200 audio settings'. No scripts were extracted, but the PDF structure and URI usage are indicative of a phishing campaign.

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://botokaw.ru/strik?utm_term=yaesu+ftdx+1200+audio+settings
    • https://cdn-cms.f-static.net/uploads/4404964/normal_601ef80b097e1.pdf
    • https://cdn.sqhk.co/kepilujofeje/ibABzZu/umc_hospital_new_orleans.pdf
    • https://cdn.sqhk.co/pulazapusaw/idpyjbC/55038987766.pdf
    • http://ragitikevuwa.22web.org/beginner_english_vocabulary_list.pdf
    • https://cdn-cms.f-static.net/uploads/4383929/normal_602f879dc090a.pdf
    • https://cdn.sqhk.co/suxugipajepo/sja9r4a/brochure_background_design_templates_free.pdf
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5fffeb9bc105b.pdf
    • https://cdn.sqhk.co/pidenali/ioYVotV/85001009642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kofeninoxilerif.epizy.com/decadencia_y_caida_del_imperio_romano_gibbon.pdf
    • http://dewakerulu.epizy.com/consecuencias_del_accidente_de_chernobyl.pdf
    • http://zedoliwitimevaf.epizy.com/85745056973.pdf
    • http://fagewoxe.epizy.com/xbox_one_wireless_controller_bluetooth_headset.pdf
    • https://uploads.strikinglycdn.com/files/59a842d8-7425-44e2-94c9-252c2d5c0273/10789751733.pdf
    • http://xubejivulovitam.rf.gd/zoxokas.pdf
    • https://uploads.strikinglycdn.com/files/1fda683e-6c2a-4394-8c93-2ed15bd5deba/kigiromuduvukanog.pdf
    • http://jogatitow.epizy.com/9689151551.pdf
    • https://uploads.strikinglycdn.com/files/e303d4de-70b3-4d9c-8c33-ef1097da843c/raxisolikebunew.pdf
    • https://uploads.strikinglycdn.com/files/39bb206f-2b62-4618-ac2f-b25d92bebb87/what_are_output_devices_explain_with_examples.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_off0000f8f1.bin
3bcbea339f60640471ac711affca945cae32ce43afb85a12826d53968abb3417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 5300 bytes
font_01_sfnt_off00010b1e.bin
f156fc073538e163216373043595c45d4d9658feb25b6576dc52fb0e7fe3d6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 11580 bytes

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