Malicious PDF — malware analysis report

Static analysis result for SHA-256 d580e598a905cbb8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 04:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7b4c69d9932f5d88385683d99ec440b SHA-1: 5f2c36ef393793013fef2908145bfab5b14fbd4a SHA-256: d580e598a905cbb812377d8cad1375b022f4ab1001dbe31262330c56fa9ae57c
66 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. The presence of many distinct, potentially malicious URLs indicates a likely attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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 https://topupdana.com/contents/files/684671201.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f650c2e51---lopiboxok.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/popir.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/ledobolukanenepizimufina.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142dca4a06e6---futibosevegaso.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/91356321760.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/lixajeduxulikaluzuwuko.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-01-14-57-99.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/zoxam.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafowedepibuz.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.pdfIn PDF document text
    • https://lesura.net/userfiles/file/65955748128.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/gawasiveb.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/29630048833.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/vawoxadoduvefitelu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/56901676431.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zomatezuzirevupodezeja.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/madefaluwi.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/derolidetavetibosu.pdfIn PDF document text
    • https://dhesient.com/media/merajelisilizi.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/jaxeguwo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/valilibovixajexazoguxajuf.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/vuzojomuvakatumas.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/luwunepunabafivojatemukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=boruto+skippable+episodesPDF 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_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 15820 bytes
SHA-256: 78d95c5a0cec66336790929adbaad1eea8bf4312522e2b27b6d90f1915e78229
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 10668 bytes
SHA-256: 86db49f490f346042af893b2a20b1e0b7c09022f299dea5261ffc0f9e138e0f4
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1