Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15c7952fac6d11e…

MALICIOUS

PDF

38.1 KB Created: 2020-03-07 20:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3501e953fb1d7dfaa38acbb1f6b41b58 SHA-1: 7e90fde9cbe86415c4e4bd8a885708e952656d65 SHA-256: a15c7952fac6d11ea76806df9c057568a95df176fd7ad5fba672b5b2fa83395e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, forming a link farm. The primary URL points to a page discussing capitalism and socialism, likely a lure. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a network of linked PDFs, suggesting a traffic generation or content hosting scheme. No scripts were extracted, but the extensive link farm points to a malicious intent to redirect users to potentially harmful content.

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://quanxunwangbeiyongwangzhi.br3h.com/uploads/1/3/0/6/130603919/130603919.html#caracteristicas+y+diferencias+del+capitalismo+y+socialismo
    • http://northwestuu.com/uploads/1/3/0/3/130312914/c9e49d953c2.pdf
    • http://aerialarts-classes.com/uploads/1/3/0/6/130639396/xutubiz.pdf
    • http://psrglobal.net/uploads/1/3/0/2/130270859/sivofel.pdf
    • http://evolutiontaco.com/uploads/1/3/0/3/130379164/mikizefive.pdf
    • http://davidgarson.com/uploads/1/3/0/7/130776007/4e97ac.pdf
    • http://bridgeequityadvisor.com/uploads/1/3/0/3/130324385/be0c9e6cee5435c.pdf
    • http://helpmepc.com/uploads/1/3/0/7/130776407/2051907.pdf
    • http://405859371116689942.com/uploads/1/3/0/6/130621158/9167561.pdf
    • http://milegion-legacyrun.org/uploads/1/3/0/7/130776823/fepobulok.pdf
    • http://trueleadershipconference.com/uploads/1/3/0/6/130620803/bozosezazat.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_off00006a73.bin
725aa79f820976e6467de73f8221fbf0ac912626d448e1edf92f692fe0122f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A73 8516 bytes

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