Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2cab46a106a7cd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 19:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cabf6fe7d6979a3dcbef722d14f1ade4 SHA-1: dd92d5be0d185eebabb0662f111295734ce3ec49 SHA-256: 1d2cab46a106a7cddf5c6a950cd877d87630402ffc620a81cbc6117fc2e48acf
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further indicates a social engineering tactic to trick users into downloading the document. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ndfeef.com/radiant/mechimobiles/userfiles/files/51649528833.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jipegodifedeminati.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/9108493659.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/pumomaduvagaj.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/xuxive.pdfIn PDF document text
    • http://naviway.su/upload/files/56943431513.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021916199468990.pdfIn PDF document text
    • http://etre-belle.su/images/file/35379704157.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329b95be513---28883564649.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/xulidef.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/baxoputokolawa.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vapatibavepawogifidefe.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/11985700144.pdfIn PDF document text
    • http://fgosvo.ru/files/files/79924687037.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37428834440.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/fuxavakinajutixunobotir.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/piwilevobitevafejox.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/zupewekixoneji.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/18493942068.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/43634920833.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4aebf02e4ed199322505db23e0f1d601/vigekedinomotizomamikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+see+post+in+private+accountPDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16720 bytes
SHA-256: aae9cfcf351e3f0d4afd0bb608086dcac8f646627008e4e6dafe55ed256091d0
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10564 bytes
SHA-256: f05e257838e9e313ac80d18c61765ba47b79d93fff39abcdebfbf22e7cf7d21e

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