Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fa7268c97e21e3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 08:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e0aa93e7d19c6c60c198772057d3671 SHA-1: 28f214bbdab191c6e547de16a7cf708db2ca881d SHA-256: 15fa7268c97e21e3f2bc8c66dd4f4fcd52cc40bd4435fb43b76ab546c062325d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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://inwebjor.ru/uplcv?utm_term=30+rock+streaming PDF link annotation
    • http://poorclarescork.ie/images/86026960436.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/80530696529.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f815d44e5a---17530791189.pdfIn PDF document text
    • https://mihalex.by/files/files/jigurinu.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/rezafifosagofuwovaze.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zapuwegimogurufudim.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73780679534.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ridosagilenososekazaro.pdfIn PDF document text
    • http://maihome.hu/admin1/file/vudiwunenupo.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/jajubejabokorenofovarok.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/petizelo.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/bigurukesufesopunawumab.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f585ffa5f70864cd38f8e226a8884c7d/fazafakofawamuwol.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/ledafuligolizenomoja.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/53486705362.pdfIn PDF document text
    • http://flirdining.com/uploads/files/45689795380.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/24950917367.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/42321448324.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/50655312532.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vifuxaroxusepenawolekolem.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/96755853213.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/mavederatepudiri.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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 18068 bytes
SHA-256: b7905ff045ab8327dc039c41564ed41257a152b389cf1ae3a0ff8136f4f6de0f
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 10816 bytes
SHA-256: 7118ffe1a01f2f7e4e337ea2cc3f36e43087bdc7525baada15ee71b7df92d80d
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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