Malicious PDF — malware analysis report

Static analysis result for SHA-256 1166831b43b83a1b…

MALICIOUS

PDF

57.4 KB Created: 2020-06-13 18:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb42794ccae0ba75c453ff19dec66991 SHA-1: 11f7179d8d27d922ba6a0de4fb613f6087052fa6 SHA-256: 1166831b43b83a1bb0f950e4b05744aef6140c4310ca542d5bb7137f9828f107
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of numerous external URIs. While no scripts were directly extracted, the structure suggests a potential for JavaScript execution within the PDF to facilitate these redirects.

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://angelsathomeclean.com/uploads/1/3/0/7/130775643/130775643.html#%25D9%2583%25D9%2585+%25D8%25B9%25D9%2585%25D8%25B1+%25D8%25BA%25D8%25A7%25D8%25A8%25D8%25B1%25D9%258A%25D9%258A%25D9%2584%25D8%25A7+%25D9%2585%25D9%2588%25D9%2586%25D8%25AA%25D9%258A%25D8%25B2
    • http://secondchancearound.net/uploads/1/3/0/7/130738918/minepol.pdf
    • http://samuelcabrera-realestate.com/uploads/1/3/0/5/130551641/rupame.pdf
    • http://therealjamesrenner.com/uploads/1/3/0/5/130589009/e9decd4bc22a0.pdf
    • http://projecthdata.org/uploads/1/3/0/3/130323552/jaweribimuzi.pdf
    • http://mail.lifetackled.com/uploads/1/3/1/4/131453100/6ccc6f4288a10.pdf
    • http://jimcolliermd.com/uploads/1/3/0/9/130969190/261651d9cbf9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rapesopo263753881.files.wordpress.com/2020/06/49081884748.pdf
    • https://zuporewa.files.wordpress.com/2020/06/mawinigokugojenupuked.pdf
    • https://bemigikub.files.wordpress.com/2020/06/tevolekuzimetikokanaravu.pdf
    • https://riwimatuko.files.wordpress.com/2020/06/raruwejudogananodorusa.pdf
    • https://buzaxobim.files.wordpress.com/2020/06/dulopakopu.pdf
    • https://kosimebumoni.files.wordpress.com/2020/06/jukape.pdf
    • https://rujosodudox.files.wordpress.com/2020/06/73556600792.pdf
    • https://renegaj.files.wordpress.com/2020/06/puwuf.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00007ea1.bin
73a1e9e7d0c8d5f0f87ba8e9bf1e5f468ee86b25139609f27d5b357dd2635b8e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7EA1 28248 bytes
font_01_sfnt_off0000b081.bin
f4d3a2bc202ded2956e94ced4083eb4a91a84db96fb24201c93b07531b87e916
pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 12096 bytes