Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1779ab30e962d1…

MALICIOUS

PDF

40.0 KB Created: 2020-04-07 09:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ae2be7700e92da09498084353fe0a5c SHA-1: 204606fac4e4beced0cce4f91524f8cb394c324c SHA-256: ae1779ab30e962d188fe1a4eed7fa94756e1dbe80a8b147437ab321f357ba5b6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The document body, though partially corrupted, contains text related to "Exponent rules discovery activity" and references the same URLs found in the heuristics, suggesting a lure to external 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://chandra-biermann.com/uploads/1/3/0/7/130775362/130775362.html#exponent+rules+discovery+activity
    • http://joeandbudstowing.com/uploads/1/3/1/1/131164095/af1512b04.pdf
    • http://montrell.net/uploads/1/3/0/6/130639087/pisuwugifomivo-gufazat-vufofumitevujod.pdf
    • http://klassyentertainment.ca/uploads/1/3/0/4/130483765/liwag.pdf
    • http://maxamoline.com/uploads/1/3/0/7/130739826/rosojux.pdf
    • http://bloxy-shop.com/uploads/1/3/0/6/130639528/951140.pdf
    • http://jamesstreetselfstorage.com/uploads/1/3/0/6/130604335/libusajurapazit.pdf
    • http://family1stpropertiesllc.org/uploads/1/3/0/9/130968972/sozuriroram_murajikutononen_mubazamevejiwe.pdf
    • http://diegojmurphy.com/uploads/1/3/0/4/130488228/wowonimezoxat_xegux_nexifubip.pdf
    • http://organicfromjosh.com/uploads/1/3/0/6/130620986/vexoretiredom.pdf
    • http://radiogirlcami.com/uploads/1/3/0/3/130379237/nodufuwogo_zulejozag_sitirokar_zadumuve.pdf
    • http://lordshomeinspections.com/uploads/1/3/1/4/131408664/db5bc6bda3.pdf
    • http://xn--repasprpar-h7ad.com/uploads/1/3/0/6/130621893/vorobovuz.pdf
    • http://terrellcooper.com/uploads/1/3/0/6/130639240/3832268.pdf
    • http://nvautocare.com/uploads/1/3/0/5/130541661/1730794.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_off000073c6.bin
f26da2abd1ce690f667662fc0d1df8714e4f22e9d93c3c8d46190e914c1e5415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 7764 bytes

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