Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceb3e19d21dc14a…

MALICIOUS

PDF

36.3 KB Created: 2020-06-13 21:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daaa87a60be6cadb6068e262ac5ae1b5 SHA-1: 39d53958e06ca3b2bed8f5557a91d892a1629060 SHA-256: 7ceb3e19d21dc14a552f0cd7e6cca9628b7631c8c57c09b27e4532c727b92e47
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent. The embedded URLs point to various PDF files, suggesting a link farm or distribution network. The document body itself contains garbled text and URLs, further supporting the link farm hypothesis.

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://ab.undesirable.us/uploads/1/3/0/6/130604625/130604625.html#metalik+ve+ametalik+%25C3%25B6zellikler
    • http://glowbullmedia.com/uploads/1/3/1/3/131379402/runova-xumifovagazitu-fexosaxanemipa-lanozudinixa.pdf
    • http://server-2012.communitychoice.us/uploads/1/3/1/6/131606126/7442364.pdf
    • http://huffmediaservices.com/uploads/1/3/0/5/130590215/tamubepetala_pakusuduxiwegi_jigeretafo_nikiterom.pdf
    • https://legefexuvo.files.wordpress.com/2020/06/58427749403.pdf
    • https://dosuxotebim.files.wordpress.com/2020/06/86938179319.pdf
    • https://bujoguzone.files.wordpress.com/2020/06/wodunazuvikozam.pdf
    • https://jurutetufot.files.wordpress.com/2020/06/fiwafenimujaselejufi.pdf
    • https://mapomipat.files.wordpress.com/2020/06/16055825282.pdf
    • https://ribepoxo.files.wordpress.com/2020/06/kobawu.pdf
    • https://buzitafovudu937855434.files.wordpress.com/2020/06/loxojanoroxugom.pdf
    • https://xonoreja.files.wordpress.com/2020/06/71772318764.pdf
    • https://rijubunaji.files.wordpress.com/2020/06/firunofediku.pdf
    • https://gugemijo.files.wordpress.com/2020/06/moselovixamova.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d74.bin
c5bbafee081df6c9f5c0f9d7fa2124fdd89524356a507c125e5f6e334e983b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 11960 bytes

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