Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c4a3b895a7777f…

MALICIOUS

PDF

101.2 KB Created: 2020-11-25 01:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d2a68d11e66bdf9fa72d59f7bfe05408 SHA-1: d756b2b46cfbab00e483170e2171f19fe2c750ff SHA-256: 66c4a3b895a7777f8d169edfbb5c94da410fdf21993f5b8557ba948e3494c4ce
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'trafffi.ru' was extracted, suggesting a phishing or redirection attempt. The document body contains obfuscated content, and the presence of embedded URLs further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=yella+beezy+age PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fcfed8cb-14b2-4d24-a627-faf668ad81a9/capitalizing_titles_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/6405159618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e647699f-ce34-4347-a2b1-f964e55652f1/sevikovux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f025c78-9424-4192-a906-00f2739da7f6/yamaha_keyboard_ypg-235_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/buku_matematika_teknik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27ea127-e7b8-4b8c-a6a1-da9403cd5484/juvadel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81518efd-3566-476b-9473-cd08405a537a/tasuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/uc_download_apk_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/tukeveba.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/aha_aspirin_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/affidavit_format_for_duplicate_marksheet_icse.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/raniboxasazageb.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/zivox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49fac40-7a38-4e2b-bf79-7efc65d1e580/xedefakekix.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/37766709486.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
    • 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_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 4276 bytes
SHA-256: f335504327ba2ceb41fcdd14df52cd593c4ad9e1a789d1a0bac16b28e6625db2
font_01_sfnt_off00014127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14127 11972 bytes
SHA-256: 49c8505a3838c8faac8d94b26a6a916a0edfe1716bbc51308c3a03585d4355e5
font_02_sfnt_off000169bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_03_sfnt_off0001777f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777F 6276 bytes
SHA-256: cac190dafab596f9a8a4d8c513c2ebe624a67245a8b2ec99746774dd8838e56e

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