Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1cf6f4d5b4c64b…

MALICIOUS

PDF

93.7 KB Created: 2021-04-03 20:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d537d2fd7b484252cc3988f94578a3 SHA-1: 5e6c65a74c291d37928662a74c93bc27730af7c4 SHA-256: 3b1cf6f4d5b4c64bd9ff3700dc2b1627b101ae37cdc9d625e97e1c41b8a5de7c
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that leads to a domain associated with phishing. The document body, though heavily obfuscated, contains text suggesting a lure related to learning Arabic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=apprendre+a+parler+l+arabe+pdf
    • http://duxojiz.iblogger.org/adecco_salary_guide.pdf
    • http://pakefuvinaput.22web.org/53574326253.pdf
    • http://tenopokas.22web.org/59393644263.pdf
    • http://kinatoguvekajux.22web.org/fitted_crib_sheets_size.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://najaxobefirag.epizy.com/placement_report_iim_kozhikode.pdf
    • http://momugegunimex.rf.gd/39229473837.pdf
    • http://zudupaxub.myartsonline.com/balance_sheet_analysis_and_credit_appraisal_for_bankers.pdf
    • http://firiwigisu.atwebpages.com/felizebuxalesutageju.pdf
    • http://zudakilaf.rf.gd/pregnancy_stages_week_by_week.pdf
    • https://s3.amazonaws.com/sevoga/91114578047.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/cd_burner_free_italiano.pdf
    • https://s3.amazonaws.com/kegubinefuda/data_communications_and_networking_forouzan_solution_manual.pdf
    • http://kexojobozajase.rf.gd/90357916972.pdf
    • http://vaxeridijif.epizy.com/wevexuwilixagowukolubero.pdf
    • http://lugirike.epizy.com/conclusion_for_lab_report_animal_tissues.pdf
    • http://labireninofut.epizy.com/60155262910.pdf
    • http://gafawazela.epizy.com/9504106197.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013b0a.bin
e258d269215e8043e6f4a4eea45ae664bed106c8fec7b7eaf249cb39dab35301		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B0A 24848 bytes
font_00_sfnt_off0000f546.bin
595c7eac4b42a6781ff2345ddfa1b2c4e3f1f7d608474b460d0d229f46ff7993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 4984 bytes
font_01_sfnt_off0001063d.bin
db73087fb5c4edd6433ce83d8e12ac23ddcdd7176614d86789ed863fdce63638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 2328 bytes
font_02_sfnt_off000110bf.bin
65ae694a3d8dc7c5629bfd67fb78b0ad7ec64fa48e731a3d7a99f7f231dc0359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 13388 bytes

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