Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cc1a1edcdc34fc…

MALICIOUS

PDF

54.0 KB Created: 2020-04-15 08:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b311c8a4397fe0cab7e7a1ae85654798 SHA-1: 9cc70043ec7d1aebd40054cfabad56209ca839c2 SHA-256: 92cc1a1edcdc34fc060083d702acd5d25bb86e617a6ccd0583286f4166745c04
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence. It contains numerous external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The document body, though partially corrupted, contains text related to 'Principio de absorcion atomica pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure for users searching for specific PDF content. The presence of multiple unknown URLs strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 3

  • 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
  • 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://blissfuldeals.net/uploads/1/3/0/3/130323311/130323311.html#principio+de+absorcion+atomica+pdf
    • http://oliviabowmanphotography.com/uploads/1/3/1/4/131453259/pemunafaxuv.pdf
    • http://wtbstv26.com/uploads/1/3/0/2/130288883/gimut_tovuniliber_ziviwix_narigifu.pdf
    • http://desirss.com/uploads/1/3/0/7/130776743/lulutovatawo-koxuporufuv-jazupexodu.pdf
    • http://windowcleaningarlington.com/uploads/1/3/0/7/130776740/refodigirul.pdf
    • http://ginecologiacassis.com/uploads/1/3/0/6/130603925/7534554.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_off00009dc8.bin
a2ee5a98aacbe4b4acc50d9f353214388bf53abed4881c2fee02688d04a6c252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC8 9648 bytes
font_01_sfnt_off0000c036.bin
99703f11fb83cc9cf0af41b4f80b162e8b9a24ae59b848c582a36f5b5e1e0a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 2888 bytes

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