Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8644d845477323…

MALICIOUS

PDF

78.3 KB Created: 2021-03-27 16:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 284af5126194f1dc4c347f0fc8780126 SHA-1: 1f62223a38ec5e1e392d14bfa3c9d4da4f246558 SHA-256: 4a8644d8454773235d35eaa4edcb34b4f9821e3f0f627f9d1d855e81b002021a
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=kotor+apk+cracked', which is flagged as malicious by ClamAV and a machine learning classifier. The document body is heavily obfuscated, but the presence of the malicious URL strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitated the inclusion of the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=kotor+apk+cracked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496374/normal_6001205eaaae2.pdfIn PDF document text
    • https://napopetonepew.weebly.com/uploads/1/3/1/1/131164038/14dd6f685bc6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ffc28c7a3543.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/nosakevo-keweje-duwomugogubavoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff20459dc54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_600e5bb53e2ba.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/bLmXKEL/16662720262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_6012c2925bdaf.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/gteKKzL/vitamin_b12_overdose_nhs.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jbrWm7p/hydro_dipping_film_suppliers_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/WhahcDi/53362397890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5ff941b7a4ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600eda55858be.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/5728fbee-f7e9-4eee-8940-9f6e979f3127/is_illinois_trs_pension_taxable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7d322c-e519-4cab-aecf-866ecbba6393/english_language_and_literature_major_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef11685-5545-4124-b142-ba5179797d48/13248340700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c82d4d-3251-4560-877b-65b1464db1bb/vukodusixeniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37e935e-fb8f-4e6a-9411-5be43e4c5434/pezibanebutode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2239658b-241f-45c0-88fa-b93532b8d8e7/reweboforidoveso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 4892 bytes
SHA-256: d858bdb4ba2863d8fab4998fa0cb590721486bb6d424bdf3f1280ac9b15ebdb5
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 11028 bytes
SHA-256: 81464f41e47ee0d18bb79217612b40326057d7c9cffd476f17b7997896957cb5

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