Malicious PDF — malware analysis report

Static analysis result for SHA-256 991683c72c51474b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-13 22:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ff8fff63f9c5cf4797002d37debde63 SHA-1: 8f0154cee248b62a926765cab645fa7aa11c331b SHA-256: 991683c72c51474b84097ca4919de730adfc94c3cbf4380010b48e23b6283a70
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://vilenefex.ru/123?utm_term=binary+ionic+compounds+transition+metals+worksheet', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, indicates it is presented as a worksheet, likely to trick the user into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=binary+ionic+compounds+transition+metals+worksheet
    • https://cdn.sqhk.co/xijisejes/ja9Yxic/39012761242.pdf
    • http://zonedelukekide.iblogger.org/raletigojisova.pdf
    • http://sanadewa.iblogger.org/free_music_to_itunes_on_ipad.pdf
    • https://cdn.sqhk.co/noperizapewo/hh2FqeA/mubexowaniginin.pdf
    • https://cdn.sqhk.co/busibelifiv/e1iiCbb/kexawafezoxodujago.pdf
    • http://taxafig.66ghz.com/billing_information_received_meaning.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bajanasik.rf.gd/gamukoledavi.pdf
    • https://s3.amazonaws.com/juliziwojatige/15217126262.pdf
    • http://fulawumobolofog.epizy.com/wavelet_transform_coefficient_plot.pdf
    • http://vizulubafaxal.epizy.com/xepotenazir.pdf
    • http://laletanegimiw.epizy.com/95662136714.pdf
    • http://xabogubumux.rf.gd/nexaritojutiz.pdf
    • http://gejinafanijeju.epizy.com/how_do_i_fix_a_jammed_paper_shredder.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_0f5924d51cae4a6097efff01e6a024e6.pdf?index=true
    • http://tefesapebeto.rf.gd/49377864215.pdf
    • https://s3.amazonaws.com/safenalavojuwu/ramanizenifokilaruberol.pdf
    • http://vogidefoxafubis.epizy.com/sheet_street_towel_rack.pdf
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_49641fc5b87847fca85b0daf55430733.pdf?index=true
    • http://dexifuv.epizy.com/65211992735.pdf
    • http://godidab.epizy.com/92223230960.pdf
    • http://varewokumozikon.rf.gd/ferarobipirejojujitidit.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfb.bin
21ea48cb9ca1229acf3b532fae1daa5d7d6f1410fab599b1148bea580570551a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5620 bytes
font_01_sfnt_off0000ef04.bin
faf8fe287c1c3a1504f55f2fd0396afa5c9571c5c93bca39960342ebc6f133e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10496 bytes
font_02_sfnt_off0001132f.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 16204 bytes

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