Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc8f2ac4fc3139…

MALICIOUS

PDF

87.1 KB Created: 2020-12-02 06:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f1c7d0d4790322f1c453b05c8b444b8c SHA-1: 1c7340b232872ca4eb046c4391137f261452099a SHA-256: 7bfc8f2ac4fc31392acdb934320cd9ae83450f8ee91c6ccd9793ae9fc66514d1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that, when visited, likely leads to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains text related to 'Arabic tutor pdf download' and the authoring application 'wkhtmltopdf', suggesting a lure to download content from the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=arabic+tutor+pdf+download PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9bb2b5-4575-4a2f-bc4f-00e4a1daf3c8/brooklyn_watch_company_reddit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc009dd8787e87989674e7e/t/5fc5c81e4f98375720a7436b/1606797343722/exit_interview_template_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73798d7-2dbc-4858-a2c5-35a5691db3d8/74887338663.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/tuscaloosa_city_school_calendar_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d11ba5a-c018-4f10-ad7a-2d84df58d230/90062049865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8fff28-19b4-4ec3-b869-b1183553f834/25958880139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d20508d-200b-4b96-b8c3-f1b15dbdeb6f/parutobadugupot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2282326-3c07-4e91-8437-aea2f0672731/pakufesubutupazanudupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc3d713-89a6-4046-ada3-72dad7969912/dosificacion_para_un_metro_cubico_de.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06f31af5bf52c32881d4/1606223604048/food_chain_fun_student_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ed7b7f-00c3-4fba-9178-f027fe57952d/rajesh_kumari_dietitian.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_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 5192 bytes
SHA-256: 9620e66f6fefb5b425eb92586f15e66acf2a2a92c25faa16524b60bd07c5e7e6
font_01_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 11220 bytes
SHA-256: f5d8467bd8bf62bd98ad2718306552251973bd905271fd6707c0914cbd524883

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