Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d9044990dcc35e…

MALICIOUS

PDF

34.6 KB Created: 2020-04-09 07:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce0c35a21ebf72c2f38dacf046f9afd6 SHA-1: a66d473db25626840f9a3254ec77634a1ef0bf25 SHA-256: 86d9044990dcc35efd44d39616631183a3ca6e0b0342f24a00cba4170cebe8fe
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'link farm' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to a network of external PDF files hosted on various domains, likely for malicious purposes such as hosting further payloads or engaging in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seymas.com/uploads/1/3/1/3/131379183/131379183.html#ejemplos+de+consumidores+primarios+y+secundarios
    • http://crestonewealthconsulting.com/uploads/1/3/0/4/130488506/novevulet-jominenimemas-defux-borimuwabusa.pdf
    • http://adpfilmz.com/uploads/1/3/0/5/130543640/vukimunodadume-wewuvusajuz-zokarutigukidab-ronawuwiz.pdf
    • http://terpimarsinc.com/uploads/1/3/0/4/130483134/9456304.pdf
    • http://rein-inc.com/uploads/1/3/0/2/130273842/2a111a06.pdf
    • http://bettereditor.net/uploads/1/3/1/4/131438709/71ff4c78.pdf
    • http://t-shared.de/uploads/1/3/0/4/130435811/596008.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_off00005d47.bin
f8134cccdae8bc5e4ed48e820ff5b0c0c46ee11c67a68349bafd5bb9349780bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D47 9080 bytes

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