Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c23d8cb8ad0b54…

MALICIOUS

PDF

87.4 KB Created: 2021-04-06 17:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5bdae76a894f936191f86e4a72dd688d SHA-1: 519720b7037f042fe100f16a0e725879137962d8 SHA-256: 05c23d8cb8ad0b54df18135e1d81acbbddd68aa39ccb3bb27f7f16431e444564
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically 'https://zajinet.ru/strik?utm_term=one+million+dollars+in+standard+form'. This URL, combined with the document's title suggesting a large sum of money, strongly indicates a phishing or social engineering attack. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=one+million+dollars+in+standard+form PDF link annotation
    • http://just-gopro.com/zirewisuwoa61pe.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/zemorumunutopisim.pdfIn PDF document text
    • http://asia.kiwi/stumbling_into_happiness_reviewn08vz.pdfIn PDF document text
    • http://makeyourself.xyz/dbx_160sl_pricetssoh.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/29ca5b8d-b1f0-40e3-9681-6ae99a29a3aa/99894724143.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/fevilamelopukusoxef.pdfIn PDF document text
    • http://wevujonixusenex.rf.gd/pewug.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_7c9ea8b140a048cf93dc0f5f945bd54b.pdf?index=trueIn PDF document text
    • http://nixomirorubu.myartsonline.com/altura_uterina.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/6381340588.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_10fbc3fc1a0e48fa8ced5c893b955762.pdf?index=trueIn PDF document text
    • http://vezoxonu.epizy.com/bunnings_flooring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/simple_accounting_system_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba04d4d-43be-4c73-8f86-58bd65ac3625/what_is_another_word_for_self_reliance.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/why_is_my_intermatic_timer_not_working.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/how_much_is_a_2020_ford_escape_hybrid.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_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 4064 bytes
SHA-256: 2e578bb225d4a3dc425e3242ca54ae5d8167a478d37c8ae4b4ec64e59ee1f4cd
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 5080 bytes
SHA-256: 835497e88cbae0bdef82a10d0cd19a6347235fdf11244dd82eed012b7ed51d7b
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 12920 bytes
SHA-256: ae26632392584dda1f4d99d49b29cb43de7dd72cc22ef5725a4b800afea1af35

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