Malicious PDF — malware analysis report

Static analysis result for SHA-256 573b96456f379271…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 03:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ee2aca8fcdebfd15c043a3a11206dedb SHA-1: 410c39669609dfadc27845f29668080c7ee5b431 SHA-256: 573b96456f37927169084390104db899f9b07d90db3cb6aa4012a3caf371e093
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, suggesting the document's content is designed to trick the user into calling a fraudulent number. While no scripts were extracted, the presence of external URIs and the nature of the heuristics strongly indicate an attempt to exploit the user through social engineering, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/strik?utm_term=how+to+check+staples+rewards PDF link annotation
    • https://cdn.sqhk.co/goseluna/ijhbicb/color_brown_in_spanish_translation.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/34796976269.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/72166683387.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/temperature_conversion_worksheet_celsius_fahrenheit.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jjfiegc/spider_web_costume_boy.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/bilbao_map.pdfIn PDF document text
    • http://wufutawolemipa.22web.org/46389169133.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/ifJJGia/amtrak_schedule_san_diego_los_angeles.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/tesorukepawa.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/cdma_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/xasomegupur/ijhhdhS/98307759725.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/luworizesupox/miller_bobcat_225_nt_cover.pdfIn PDF document text
    • http://fomideveli.epizy.com/asynchronous_transfer_mode_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/39974597765.pdfIn PDF document text
    • http://nenidexixod.epizy.com/66760054800.pdfIn PDF document text
    • http://lesigoviweti.epizy.com/budgeting_books.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/xakuzuvegunufemo.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/hidrocarburos_alcanos_alquenos_alquinos.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/23082262248.pdfIn PDF document text
    • http://xafamikipu.epizy.com/formal_demand_for_payment_letter_template.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/kevimurovowakeza.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/tifonilavolebepisavadetex.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 5280 bytes
SHA-256: 3a08e42d2e3f3b9c802b5817d91e289dcd8d7395b8f93a074af58f77946dd658
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 12352 bytes
SHA-256: bd73ada7819945f40d717b21ca55319540ebcb4c8cd0fe25c44a94b87aacab90

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