Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedb7db300db7b05…

MALICIOUS

PDF

27.6 KB Created: 2020-05-22 04:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f11a7b1c5bfa79f57d24ab89a5128ed7 SHA-1: 185c81040e2ac806bfb5bd35c1061805f6ef2c15 SHA-256: bedb7db300db7b05facf9d6a373e76f49fbbcd286a1fed78044cd4e3a592433c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This technique is often used to obscure the true destination or to distribute malicious content through a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious intent.

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://wangshangqipaiyouxizhuanqian.br3h.com/uploads/1/3/0/2/130289259/130289259.html#detention+slip+pad
    • http://csparling.com/uploads/1/3/1/4/131438423/kewefar.pdf
    • http://marengineering.net/uploads/1/3/1/3/131379689/zurowaka_difurutuxobowib.pdf
    • http://uniquegiftsinc.com/uploads/1/3/0/2/130289227/zilokenuwatanoki.pdf
    • http://tasmaniacountrybakehouse.com/uploads/1/3/1/3/131383771/331b91ee7f1.pdf
    • http://envizionitministries.org/uploads/1/3/1/3/131398582/f9f5e295ab637.pdf
    • http://asianbuddhistassociation.com/uploads/1/3/0/4/130488512/zubeludoz_vazigifis_golikanivoxanoz_wefegidakuti.pdf
    • http://stormstudents.com/uploads/1/3/0/5/130589217/7231011.pdf
    • http://fitzgeraldpropertygroupllc.com/uploads/1/3/0/3/130313105/xupurulexu-lujevun-zosajolukozufe-zakazedulenixa.pdf
    • http://thebelletrio.com/uploads/1/3/0/9/130969551/5547014.pdf
    • http://everyday-tennis.com/uploads/1/3/0/7/130739646/7605408.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_off00004470.bin
7c4b2dfbbdc9e1e6570bfdb5e8b00c198c65ee4b4fb028fa2cdad57c491f3244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4470 9136 bytes

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