Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33659fa7512eaad…

MALICIOUS

PDF

52.3 KB Created: 2020-04-10 01:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15f78da5d5eb4892b67db1de364b8d3a SHA-1: 7a8beebd2ce83283b6cc9b3de19153d831448e60 SHA-256: d33659fa7512eaada5ea8ad6f7423469f7c2927cd06ec67f72ab6ffbaf88fb79
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, characteristic of a link farm designed to manipulate search engine results or lure users to malicious content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a series of external URLs, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mysitelive.org/uploads/1/3/1/6/131607733/131607733.html#earl+sweatshirt+some+rap+songs+downl
    • http://dsprototype.com/uploads/1/3/1/0/131070011/cf8fe3d9ac82c.pdf
    • http://airambulancethailand.com/uploads/1/3/0/6/130604034/4681751.pdf
    • http://gpsengines.com/uploads/1/3/0/2/130288410/9855690.pdf
    • http://creaturesandotheroddities.com/uploads/1/3/0/4/130435787/9787660.pdf
    • http://adanfinancial.com/uploads/1/3/0/5/130590561/2672278.pdf
    • http://vantasselart.com/uploads/1/3/1/4/131437222/ronelifozamol.pdf
    • http://zoe-roxanne.com/uploads/1/3/1/6/131607240/zurelofoluja_tovoloduze.pdf
    • http://ouidutch.com/uploads/1/3/1/4/131483371/pixuzejilanibipir.pdf
    • http://thenaturallearner.com/uploads/1/3/0/3/130323936/dazowof.pdf
    • http://lsestore.com/uploads/1/3/0/5/130551127/22b7642.pdf
    • http://lawrencebudgets.com/uploads/1/3/0/4/130477890/veweburelagodizebeki.pdf
    • http://rebeccasonline.com/uploads/1/3/0/7/130776714/2558709.pdf
    • http://wedobusinessinsurance.com/uploads/1/3/1/4/131453358/3d9d6e6fb668.pdf
    • http://canadianwoodtruss.com/uploads/1/3/0/7/130739213/migobaxi_xelajorunedu.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_off0000a327.bin
9704d6c985de09bd7b481e36c4d847fd8b4efbf3afa8549a8744d082c5e6aa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA327 8836 bytes

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