Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc099a3b28a98daf…

MALICIOUS

PDF

74.6 KB Created: 2021-04-20 22:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e9fb0606f0b4930043f06752e3d6a9 SHA-1: a378b03dad5940f80dea7ce6750b564fd0187e09 SHA-256: fc099a3b28a98daffa3d8d4fe688b8f51bbc47a4df5fba7441d127d6d1818798
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL identified as 'https://soxebez.ru/strik?utm_term=angle+relationships+worksheet+%25232+pdf'. This URL, combined with the 'PDF_SEO_LINK_FARM' heuristic, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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://soxebez.ru/strik?utm_term=angle+relationships+worksheet+%25232+pdf
    • http://vofuvomo.iblogger.org/performance_appraisal_meaning_in_tagalog.pdf
    • http://kexagatedonekun.iblogger.org/magistrate_report_and_recommendation_florida.pdf
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/6100387.pdf
    • http://nuzenurego.22web.org/kilalobufuvigegepa.pdf
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/wunudebipevuwidises.pdf
    • https://cdn.sqhk.co/vibisidumes/rhbfTib/cheetah_running_speed_km_h.pdf
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/a85861985b.pdf
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/8309965.pdf
    • https://cdn.sqhk.co/zisiribamen/n4hjGw5/water_pollution_journal_articles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_d4d7e012403046a2b4e83330e9511d8b.pdf?index=true
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_295c33b1e7ca4f608130e477813217b2.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_bda0dab287d742e3aa7e8c68b505cf05.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_5f64c4825ba447b29d339049ec309b9d.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_67b3cc22557d448fba67c03eb51b36cd.pdf?index=true
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_700498acbd284ff6a4f85de5cebbe6db.pdf?index=true
    • http://nuloporime.rf.gd/65270152872.pdf
    • http://zaramapowo.rf.gd/spotify_premium_free_android_2018.pdf
    • http://tituvuten.rf.gd/alessandro_cagliostro.pdf
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_1bee68b6992b406385e9e36d2b030f06.pdf?index=true
    • http://kubagaxupusu.epizy.com/womixalebo.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_off0000e769.bin
7ebd1415b3f7b4add5dee30cc263136ea9873bef68d07e2df32c0bb511f22230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5224 bytes
font_01_sfnt_off0000f93c.bin
334fae8a0ccbed572cedadfdd4aaa556ace6432a12f94798572d85f4decfc77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 10516 bytes

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