Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa8ebd1bc99b73c…

MALICIOUS

PDF

35.6 KB Created: 2020-04-11 08:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e9f3d72fe2f6fee642414895573e615 SHA-1: 38c146ac78478e374371f7fbc4716f46c25fe6d1 SHA-256: 8fa8ebd1bc99b73cfe2a451fde19991fe0c30435d77a34b6cae10a1d4aa04b5c
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 classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains references to URLs, suggesting a lure to external content. The primary intent appears to be directing users to a network of SEO-optimized or potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cpanel.ladse.org/uploads/1/3/0/2/130287845/130287845.html#common+french+phrases
    • http://alpinecbd.co/uploads/1/3/0/6/130605292/seduribofavutemigi.pdf
    • http://joyceknock.com/uploads/1/3/1/4/131483550/supujuti-bamutowuwo-kilitexofuliv.pdf
    • http://everythang100.com/uploads/1/3/1/4/131407539/kofewim.pdf
    • http://reikitummomalaysia.com/uploads/1/3/0/6/130621026/294735.pdf
    • http://ian-greenphotography.com/uploads/1/3/0/5/130589275/vameturew-nekomawazezag-komakevo.pdf
    • http://ogdesigngroup.com/uploads/1/3/0/6/130639409/sizurolevododat.pdf
    • http://cobrafreight.com/uploads/1/3/0/7/130739225/xotaxuvanud_tagofibinif_tufilafumerepu_fapigopefamir.pdf
    • http://bethanyclarephotography.com/uploads/1/3/0/3/130379431/3c8ceb3444da.pdf
    • http://www.com
    • 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_off00006056.bin
be125baf4b30ec626a45d5dcafcbe9913b00ac6916604a453ec3101c9e011dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 10204 bytes

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