Malicious PDF — malware analysis report

Static analysis result for SHA-256 357008db9c75ebac…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51c079b6cad1b648e89476b1345801ef SHA-1: 4bf404c4812ad6f3bb372e41de754576cd207348 SHA-256: 357008db9c75ebac460d0aba41114b18266dda78a593b520fe6cb93dcbef6f55
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's purpose is to redirect users to a large number of other PDF files hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://maimungkorn.com/UserFiles/file/21785223522.pdf In PDF document text
    • http://prinsart.ro/uploads/files/36098053608.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/buperibawoxiputi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161411a101662e---kokezak.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/penexetixuvatuwajajo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/mijuginawijexozejo.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/sezer.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/7465015693.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/87891487377.pdfIn PDF document text
    • https://rajakedua.com/contents/files/62775070198.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210901_153627.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/wifafosawedamubipi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/35511597480.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/dalapod.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/leperozufosubu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/49076938488.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xovijolozulesowategulopu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/29584307224.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/97147168588.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/19412641233.pdfIn PDF document text
    • https://inarsindbari.org/uploads/94195736657.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/9119208251.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/rejixosotofikafepi.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/75042617726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+music+from+my+sd+card+on+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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 10940 bytes
SHA-256: 0844e4c7c8c9006d0dae718f8439b383638d6e8a1f74a0c01c29646c1428ad3e
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 17148 bytes
SHA-256: e113f41a3d97d53c084d070e051cd4a251fcd1c180ba42581986775565c73f70