Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c0b56294d1fb8c…

MALICIOUS

PDF

87.8 KB Created: 2021-05-15 00:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa42f14a656615d6dc35eed0e3d68313 SHA-1: 40f15db0f1805fb64babea995724d93c68e8a5c4 SHA-256: b8c0b56294d1fb8c33a8d0da8a1ed771278e4e9289272c3f7d4630a2aec3f4e5
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to learning English, suggesting a social engineering lure.

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://kuzutuzo.ru/strik?utm_term=aprender+ingles+basico+por+internet+gratis
    • http://acupofjacob.com/kinibogafisegudemulopuy4a87.pdf
    • http://creditinquiry.info/mefolasabadikinisftse3.pdf
    • http://elerctum.org/printable_weekly_timesheets_templates7mtr8.pdf
    • http://idealica-ordina.site/abdul_kalam_biography_in_english_downloadih954.pdf
    • https://cdn.sqhk.co/demapibo/Tgimjbf/14340084606.pdf
    • https://fojaloda.weebly.com/uploads/1/3/0/7/130776233/xogidomev.pdf
    • https://gebipobewixaduk.weebly.com/uploads/1/3/4/6/134631326/3d00131d.pdf
    • http://nubatevujonuw.mygamesonline.org/accounting_definition.pdf
    • https://cdn.sqhk.co/wujakegu/fhggQVu/masisuvemubibu.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/telozegurivatovojevel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lefazef.epizy.com/el_federalismo_mexicano.pdf
    • http://bopisumeku.atwebpages.com/84129582726.pdf
    • http://puribisipup.atwebpages.com/ferugut.pdf
    • http://jezevenakos.myartsonline.com/tan_application_form_49b_download.pdf
    • http://bozusofofutuv.rf.gd/it_can_if_you_can_song.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_off0001004f.bin
feb103a9af8ea284c8a133d0ca6be967940b06d54daf942393b20486bf45c1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 5368 bytes
font_01_sfnt_off0001129b.bin
632978ecd2b0fad8844607ada5a4fff8634a0c347b38d33d9205d87ce5ed5641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 12368 bytes
font_02_sfnt_off00013ada.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 16204 bytes

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