Malicious PDF — malware analysis report

Static analysis result for SHA-256 606ab0184f215246…

MALICIOUS

PDF

49.9 KB Created: 2020-04-23 12:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6c064b7173b9bd1bcc8eca07ba8b3cae SHA-1: bf94623c5e29047a0db211c54077e89ae00b6d69 SHA-256: 606ab0184f2152466c34ae57eba5729f793cb206821ed9d4a507ddd27b043db7
104 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, many of which appear to be part of a link farm designed to improve search engine ranking. The document also contains a call-to-action phrase, suggesting a lure to download content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://simplicityaccountingllc.com/uploads/1/3/0/4/130483305/130483305.html#z390+aorus+master+user+manual
    • http://teboxretail.no/uploads/1/3/0/4/130491322/c9f9d0b2febc2.pdf
    • http://andrimargamboa.es/uploads/1/3/0/6/130621352/6010248.pdf
    • http://reagan-davis-photography.com/uploads/1/3/0/7/130776695/5ceddba7dfe50b1.pdf
    • http://gyaanganga.org/uploads/1/3/1/1/131164118/2378714.pdf
    • http://lulustonedance.com/uploads/1/3/0/6/130620931/soteru.pdf
    • http://micahandersonmfti.com/uploads/1/3/1/4/131453312/43cd16.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008528.bin
56f321a4d03fa0d69edd9d59ab5f793d23851cbd21e9c64c4ad7ca55ca7319cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8528 8708 bytes
font_01_sfnt_off0000a679.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA679 16140 bytes

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