Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f01d755ca453c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 20:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 986e4c8da4c528249abeec36011a62ae SHA-1: 98dc4f843c4a187311f52b5b01599e25f85f25c2 SHA-256: e20f01d755ca453ccaeb2ebebca7539cdb6b202e7401de2563c3dae2338e8935
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to 'allytemp.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=timo+music+app+download PDF link annotation
    • https://mimpiindah1.com/contents/files/fusonimijafiwor.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/35557588864.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/67820399091.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed412fe6d---motiwudejomuxopobewetele.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/bizafexufotib.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/48919499988.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/97082036840.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34629526554.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/18736779467.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/96443645097.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/lusoxaxidolusozeve.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40003351147.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/97781559769.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/85229071009.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95325525---33596044612.pdfIn PDF document text
    • http://precisao.org/files/files/74400175778.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/64132542182.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/suxokojilesafum.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83559516808.pdfIn PDF document text
    • http://lukinserv.hu/file/55382981145.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/korisabiket.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://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_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 10492 bytes
SHA-256: 115fe3bd800439500827a3c4e0ff21adf318e5bc2b8e6c4d1841363c4a05076b
font_02_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16652 bytes
SHA-256: 9e9e4ecd8e91695956db43200f14da46649312279280dbe6e0ea9ce4253cf478

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