Malicious PDF — malware analysis report

Static analysis result for SHA-256 417034955844ee75…

MALICIOUS

PDF

47.2 KB Created: 2020-03-12 06:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c85a20b4d49b481f1ae3c7e9ff242a92 SHA-1: 39aa4b8f0c9895e7886dbca4cb75586a4aa5f8be SHA-256: 417034955844ee7554554df8846dd0b5657817be460ea79b88f368ea828ee499
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, characteristic of a link farm. The document body, though heavily obfuscated, contains URLs that point to numerous other PDF files hosted on various domains. This suggests the primary purpose is to direct users to external resources, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kingshotelsmunichcenter.devsite-1.com/uploads/1/3/1/0/131070379/131070379.html#pyrimidine+nucleotide+biosynthesis
    • http://webdisk.elpisworld.com/uploads/1/3/0/5/130589229/vawamamuxulen.pdf
    • http://www.wildteraniafarm.com/uploads/1/3/0/6/130639236/8613439.pdf
    • http://addongyan.com/uploads/1/3/0/6/130621220/keselafin.pdf
    • http://jimmyplease.com/uploads/1/3/0/6/130639277/73f80450.pdf
    • http://www.laurabirdsallglass.com/uploads/1/3/0/2/130289625/kejejep.pdf
    • http://appleridgedaycare.com/uploads/1/3/0/4/130435751/393de32ae.pdf
    • http://post.directory/uploads/1/3/0/2/130289613/sitinelofogojaj.pdf
    • http://www.simplynature-fineartphotography.com/uploads/1/3/0/8/130874023/gebilelukekope_zatunu.pdf
    • http://fromper.com/uploads/1/3/0/7/130775762/munowokunatedaxo.pdf
    • http://www.balloonworks.eu/uploads/1/3/0/5/130588286/da5b7f280795.pdf
    • http://www.briskenterprises-store.online/uploads/1/3/0/6/130639768/d52c0ec.pdf
    • http://fivem.lsbrpc.net/uploads/1/3/1/1/131164567/pobexazokifi.pdf
    • http://www.multilanguagebox.com/uploads/1/3/0/7/130775252/regudunojetekit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008418.bin
b26453d38789131545dd19ae512cd444ca04f00729c5dcdb7dfcb3e4ec766b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 7832 bytes
font_01_sfnt_off0000a291.bin
c048ac4ed90d63bfae46472f65f9cf6fc0bd5e75369f2d8f28771a6d96a2731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA291 3156 bytes

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