Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb2215135a373d1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 22:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0da7367f0a2e9ecf2f2d8d7cf91a85bf SHA-1: c405e81457c46671667398eb1f2663404a19e6a5 SHA-256: dfb2215135a373d10fdc1a2337a6f6d905e84e34b7ce5f7568ace21d456587e5
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a large number of external URIs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of embedded JavaScript indicates an attempt to perform actions beyond simply displaying content, likely to download or redirect to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ultrabeauty-ff.ru/userfiles/file/jefiretagivovowow.pdf In PDF document text
    • http://zeci.nl/im/image/zedinunugijisilugiruxifi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36435383079.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/mupekizofojusutovisuz.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/forekenogewemapifasox.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/88061317675.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lazenajuwaf.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/86427830141.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/sururuvofuvolelojaje.pdfIn PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/figewalumiserozidawo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/70681449616.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/53503012674.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/puruxoxevijiwixowivu.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/44201377500.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/36957484219.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixav.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/wewoluzesewaxakamib.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/gupigu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/815e8be38af6c4015b7f4faf35146bcc/mejitupepidurumejafa.pdfIn PDF document text
    • https://granitnet.hu/editor_up/likirekoxaxadikuwibebiden.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/46315068354.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/59008568890.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/83932156388.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+reincarnationist+papers+pdf+free+downloadPDF 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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 17012 bytes
SHA-256: a1f08d3c16da2afca17218735d79277221343a8f24e5101131cb8052a6b6bf68
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10768 bytes
SHA-256: f37a014829185b85ccb6c638bfef1773d5d938220ba5cf18dd38ea45ee8d6cad
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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