Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c913c9d76d62337…

MALICIOUS

PDF

105.1 KB Created: 2021-02-13 10:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8fa5964ca91371944c9e3bfa63e10f9e SHA-1: a627bd67c53fb15892654990273d89de3cb0e959 SHA-256: 2c913c9d76d6233721e1da3980ccc83d356e83c78bf7472b26b73b74c3b314ea
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to a worksheet, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=the+new+deal+alphabet+soup+worksheet+chapter+11+answers PDF link annotation
    • http://idealica-co.site/fixing_sheetrock_cracks846wq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5fcc47262bfc7.pdfIn PDF document text
    • http://ranking-se.com/95181255238kv0hz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5ff10ea0c9d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5ff4838c629d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazutun/stars_galaxies_and_the_universe_worksheet.pdfIn PDF document text
    • http://sajutab.rf.gd/rapekifibubava.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/31009952264.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/jopozetokisagiv.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/lowusitupijexasej.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/age_of_empires_android_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/kekipogetukad.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/alagappan_clinical_medicine_latest_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/al_mustaqbal_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/architecture_101.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/tekedabaf.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 5460 bytes
SHA-256: 0c0a25d38067167f8b3b0b0f95023511729b4c5eb869d9cb692ca7b73d0e5588
font_01_sfnt_off000135fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FB 19736 bytes
SHA-256: 2a2c3bf23c5f2487fff8fa7c28938b2fa524d0bcb6c1fbe1d2a8d3f9f2aab57b
font_02_sfnt_off00016f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8A 16644 bytes
SHA-256: b05d926b40e102349d2f3de22aa37d36ee96c298b77aac002623f8d1174ba629
font_03_sfnt_off000186a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A6 6128 bytes
SHA-256: 4b0f6109808a3c2fc301b4e4807b74870d791fcbddee8df6f991ff52b644b7a9

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