Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ac400327e296b…

MALICIOUS

PDF

47.2 KB Created: 2020-06-21 00:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ae18073bde060faa879596aca16629 SHA-1: 61ab35048a6afc2bc8501429e0810b1e2432081c SHA-256: da4ac400327e296b752efe9eb55ff87085cff77bd73e8996cb65ef3f15ed429e
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a high likelihood that these links lead to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of suspicious URLs suggests a delivery mechanism for further malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nostalgicsigncompany.com/uploads/1/3/1/0/131069904/131069904.html#al+este+del+eden+libro+pdf
    • http://alittlebitofsomething.today/uploads/1/3/0/6/130603841/7654875.pdf
    • http://doeyzeedesigns.com/uploads/1/3/1/1/131163684/2437911b27b13.pdf
    • http://mail.6lnkshop.com/uploads/1/3/0/8/130874153/6956418.pdf
    • http://centrodepsiconutricion.com/uploads/1/3/0/5/130543855/6350243.pdf
    • http://spanlogik.com/uploads/1/3/1/3/131383377/robeguvopowejexopit.pdf
    • http://instpastoralsocialwagha.org/uploads/1/3/1/4/131437693/bitawaw.pdf
    • http://74-123-73-221.mgwnet.com/uploads/1/3/1/6/131636833/vuromifob_nigajomoxune_gifubasufu_xuwenufulorekil.pdf
    • http://southcarolinatradeshows.com/uploads/1/3/1/6/131606874/8697592.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_off00007889.bin
2caf4960ce0ada3611f1534064ddb80887e084c03e8816cd66b1ab43c270343b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7889 4740 bytes
font_01_sfnt_off0000889d.bin
5f5ad8df02f4c9c02707669d877ab2e9133bd14ad05ecb89d21f260e41825f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 11780 bytes

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