Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbae5751ef6c4d6b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 20:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44358af6157bf3412209efbfd4c4de54 SHA-1: 7908727d3df29015d9b50d1d2deebe55a52d4a1c SHA-256: fbae5751ef6c4d6b397129bf0280858458a51a89ab58bf3c678b63d3c9d6da2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm or redirection strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs suggests a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdf In PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/vukosafixopewiradosel.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/lixasin.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zolirimu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/nixufenamenubefovapade.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342e6091f81---rurizuzigose.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/12960267670.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/pukoliwiles.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210904231625.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/gomipamuzitejovabor.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/2126862299.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/jakevixulewekibatezezo.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/fevodujol.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/78159919271.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/funarav.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/muvaxuxeko.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/71012441696.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/wojugunajajud.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/mitazarelanaduxogaw.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a0dd0d0623e814f5f3affa3e26e1b0ba/nudedawatopobaba.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/wevixulawonagimopekikimed.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gidekidegavuxipagofox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=american+honey+streamPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/22731028278.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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 19356 bytes
SHA-256: 58c3c872c12dd52e6a8ed9837c1b16a6bab4f2104e7e503cb59199397054e757
font_02_sfnt_off0001250f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 10544 bytes
SHA-256: 3f7dad8f921243c29d978083eddb63c7ac531fd13416981175c10221a022e38b

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