Malicious PDF — malware analysis report

Static analysis result for SHA-256 706de53df4b95d69…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 20:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85a93378ab70311c070f84c76cd4bf7c SHA-1: c3a24c4269d3bc861aacf8ff59e7f6656f5d0ca7 SHA-256: 706de53df4b95d694012db32a9b085723948f6fba35c3ccec81e81db6fe1995a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external domains, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://satbietthu.com/luutru/files/47984123036.pdf In PDF document text
    • http://studionegro.net/userfiles/files/jewiwekuninotonalisi.pdfIn PDF document text
    • http://osayit.com/images/file/jonedowawakogik.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-14/20210914005938231108.pdfIn PDF document text
    • http://sinners-party.de/media/file/pogixego.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/81340379918.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210925_021344.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/74826451195.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/64407791981.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/melipudiro.pdfIn PDF document text
    • http://szcftz.com/upload/75028375463.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/gabiwemewibapesagujaxilen.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u2l6b1i9apajnb4vj0e3m30g43/fasunurukoki.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/mozeguzasigadube.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/16359675866.pdfIn PDF document text
    • https://digiconelectronics.com/media/56327406371.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xezelesolonagifip.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/rezozolazadekik.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/84543422982.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/wirekarogujojexodifugaxot.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/lujazivenopidugutifes.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/22853801652.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tirojatege.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/43148077027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=appvalley+pokemon+go+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 10720 bytes
SHA-256: 385933a1375caf74332beae010b9cef9bb089c959d583af89b64f90abc1300fb
font_01_sfnt_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 15352 bytes
SHA-256: 63e3f13e00f7b9c56d3ecce166ad81f4fce9a177709de71575c7f3224af0c824