Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fa0fef2a997227…

MALICIOUS

PDF

138.0 KB Created: 2021-02-28 06:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6c68f8bd3800e1322645c9afac06613d SHA-1: 17721e060ced30c5b917c12ce1b57a680c584541 SHA-256: c5fa0fef2a9972270a7bfeb893c51b8193ebabdc6db3e5a1d870bf51dfd24ca9
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI, pointing to a URL that appears to be a lure for phishing or malware distribution. The document body, though partially corrupted, contains text related to the URL's query, suggesting a social engineering pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection to the identified URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=who+invented+numbers+and+letters PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe421a0a29e5.pdfIn PDF document text
    • http://infokurs.design/84633714558e8ypq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_600cb38b42d6f.pdfIn PDF document text
    • http://katerevemoposab.iblogger.org/bokisegojalusitakizin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5ff0317641801.pdfIn PDF document text
    • http://prosucre.pro/miller_spectrum_375_cutmate_for_salepsaof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe2eeb68100a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5ff7e841e3008.pdfIn PDF document text
    • http://fsfsfd.xyz/xikujizuxexk5r2d.pdfIn PDF document text
    • http://funogager.22web.org/authorized_distributor_letter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5ffbdfe17809d.pdfIn PDF document text
    • http://eurozone.pro/h.264_dvr_software_download_free5mchl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexotorat.rf.gd/vimedevikob.pdfIn PDF document text
    • http://razivud.epizy.com/78539425817.pdfIn PDF document text
    • http://xamijofut.rf.gd/45956214544.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/pct_applicant_s_guide_international_phase.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/bjt_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/aluminum_sheets_4x8_lowes.pdfIn PDF document text
    • http://nototen.epizy.com/visual_studio_2017_platform_toolset_v140.pdfIn PDF document text
    • http://sogigadataga.epizy.com/mijexuxixekaviwuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/22569646167.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB09 5276 bytes
SHA-256: 00b15b3aa2d0c1268e573bc8293482873c0b8d1a057c027a4058e5d3b9d63aba
font_01_sfnt_off0001dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCD2 11432 bytes
SHA-256: ac375107dd3d45223df6c4e5a20785fe2dcb4cd63b6e8a0ef40d5b96006a4228
font_02_sfnt_off00020440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20440 16140 bytes
SHA-256: ec636328779faede8178faa2f3ab35a9555c219715a158b0f3b8374f7bb26b8d

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