Malicious PDF — malware analysis report

Static analysis result for SHA-256 726e26050242ff16…

MALICIOUS

PDF

101.3 KB Created: 2021-02-17 05:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78a53e5b3f6882c77bdb15ea6f41ed75 SHA-1: 2bff37cabb7c9a2ec2016252a442c6d7a18f5df6 SHA-256: 726e26050242ff1634c55f38518ad80bd91c05a1831a43b5b373d96fdeecf0cf
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to Microsoft Word numbering, which is likely a lure. The embedded URI points to a URL that is also present in the list of extracted URLs, suggesting it is the primary mechanism for delivering a secondary payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=how+to+do+1.1+1.2+numbering+in+word+2010 PDF link annotation
    • https://cdn.sqhk.co/wozovege/3jfhehh/63110854190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fdf772172a16.pdfIn PDF document text
    • http://the-job.ru/41189922120oiodl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_6001bca9dced7.pdfIn PDF document text
    • http://bazis-rostov.com/alto_sax_sheet_music_freevac3x.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/jbgd9ij/32270839101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fe1e9258a19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_602a4068a902d.pdfIn PDF document text
    • http://doordash.fun/descargar_drivers_realtek_11n_usb_wireless_lan_utilityy57d6.pdfIn PDF document text
    • http://obzorov.site/22820717525camc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_60017802a79ca.pdfIn PDF document text
    • http://obmenkalnr.online/pofaxibafujuwezamukje9t2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd19cf10cf57.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/tiniruru/dimensional_analysis_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/e_verify_form_city_of_atlanta_affidavit.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/70325206662.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/40080164448.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/sesodaramasure.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/duzifezidofufenizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/gulag_archipelago_book.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_off00014e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 5276 bytes
SHA-256: 4fa2f45965f07407e34bde0c0695d855b4b7a0e3ee2e663ed729f57574d9b76f
font_01_sfnt_off00016066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16066 11424 bytes
SHA-256: 12d5904d5d4bedd743d7a3f035574e9d7d86d430aaac7b3f556bcd4790188513

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