Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4310db8d46a694d…

MALICIOUS

PDF

70.8 KB Created: 2020-12-04 23:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ece4cd3fae947407cad90b5b81d44f20 SHA-1: d6bb66f3f9e31a4cb610e4b7585a11939d955b53 SHA-256: c4310db8d46a694d7cd70009a16b36e5f71d9b37d1f4d6730fe4159cd3ad3230
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically a phishing trojan. The embedded URL, 'https://trafffe.ru/123?utm_term=asume+certificado+puerto+rico', is the primary indicator of malicious intent, likely leading to a phishing or malware download site. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=asume+certificado+puerto+rico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5f950c4a7e24e.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/rafiralexezol/street_fighter_v_android_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59684b6-2258-487e-b544-e922ea5f1a94/78260423233.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf480cc750a3b5a055283/1606218881115/harvest_intermediate_chinese_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a6b0df-ed61-45fb-929a-1ef788727417/windows_10_help_desk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a873e5c7695ca9a6fc9e/t/5fc4e61ffa04221c71b975af/1606739488023/femagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a00cfa-ce8e-4e8d-8579-af014a74a17e/xasuluk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58aea2e34347c7063de36/t/5fc78090c7c45a5eafa8ac43/1606910097152/moon_patrol_atari_st.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc48c744e98326c02a2d7ac/1606716532789/gukipejivigokinumogix.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/novulapamegopigisasaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80eb0a9b-3377-4e36-8e20-b257a00ea815/selegituzazikezag.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/jafemogejaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054f54c8-2243-4fb8-99e3-adc12c52bdfc/tamil_midnight_songs_mp3_free_downlo.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/cleanmymac_3_license_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0a89c7afe470b5582a6d/1606224522672/vokobawujelaka.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/finite_state_machine_worksheet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 5260 bytes
SHA-256: 9eb0ead3620acf50ca2c1ce6f65c9a0d91f135da414d6b892b657d3b29f53144
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 11528 bytes
SHA-256: 78c3802ac9306a3e0fcf25af02d49ed34806784d6dfe8b2d6b7c9479a5f5a952

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