Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be08729a969c74f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39c29fef6952dfc5c41dd0b1c1522aaf SHA-1: afee1c91e38bc3cfe356cda9d064c85cafa1b83b SHA-256: 3be08729a969c74f6aaf4466deb5276cc3cea984f526395f4f7c9fe21244f243
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://studioprogettoarchitettura.eu/userfiles/files/dotiroxalurizoxa.pdf In PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/87090651670.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/596085e6ee59f601458d4b38889eb3a1/15236498159.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/vukilinanafota.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/sukisumagunesirelime.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/24836329037.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/89254181997.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/22775076616.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9c92af24---pogizozifek.pdfIn PDF document text
    • http://apex-architect.ru/images/file/98939401942.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/3554755556.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/30890066619.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/77625943577.pdfIn PDF document text
    • https://fishuntpesca.it/file/1963726691.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/8594449452.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/69262294071.pdfIn PDF document text
    • http://blueyee.com/upload/file/141205146376.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/pofivanixarakatedafiw.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23895303708.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/99699873729.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/74935417974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dizziness+in+early+pregnancy+7+weeksPDF 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16696 bytes
SHA-256: 8e9823def0fa4347436b0522e219d9b88b85021c59fcce576b9fceccb8898807
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10736 bytes
SHA-256: bd318342ebd34c64668c9d3c1611b2959f4fa19c6eba81ccd71e3e2d72157271