Malicious PDF — malware analysis report

Static analysis result for SHA-256 a805aeb9aed36951…

MALICIOUS

PDF

97.2 KB Created: 2021-10-08 23:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22a0a023e2eae026940c61a485261419 SHA-1: 8c196be58e3b894fc82eed020f96af9e20ed807e SHA-256: a805aeb9aed36951817c3a2eebfcaa3a038c276028b49f5a90574a3f17f59e92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://eco-building.cz/UserFiles/File/90678160390.pdf In PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/96655828357.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/44995650470.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/37031779675.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/kulijokesuvu.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/11925814034.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/72300136799.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/japijilexegizajipiw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540f1920cc2---xulujazoxirasigenorofovav.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vobiriwu.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tanomuvadubujisos.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/womazopopezeduxopis.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/livukojupukes.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/fezetorogexunab.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/lafalepedorupezirako.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/74203077109.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/91247884258.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/fofodo.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/97590450272.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/43781260553.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6407990724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=analysis+of+the+sick+rosePDF 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_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 10620 bytes
SHA-256: a3207f246da8855855e29d30807dd6ceeb1c4b1d57cc3f3da3d318c6e9c54b10
font_01_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 20708 bytes
SHA-256: 3fd899d33a1453898e796464137c0f23d18711ba042cace900b06875e058bf0a
font_02_sfnt_off00015f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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