Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d319f2b9e6fb9…

MALICIOUS

PDF

28.6 KB Created: 2020-04-10 22:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0fd38323b6438735fff9fe5c1c2229e8 SHA-1: 40778665b3bbefafcd71f42300fe231682fb2b88 SHA-256: e99d319f2b9e6fb946861d4660e0715241a33e3368143b8b0bf619b7455c0753
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://74-123-76-74.mgwnet.com/uploads/1/3/0/6/130621447/130621447.html#software+scientific+atlanta+dpc2100r2
    • http://jennygil.com/uploads/1/3/0/5/130589360/dizowijosofirad_mivinufa.pdf
    • http://neurocogconnect.org/uploads/1/3/0/5/130588277/b5046ac.pdf
    • http://apexgranitesolutions.com/uploads/1/3/0/8/130874371/fuvuka.pdf
    • http://blessthishotmess.net/uploads/1/3/0/5/130539202/xuronefexowe.pdf
    • http://trendy-grace.com/uploads/1/3/0/6/130604558/1826043.pdf
    • http://baystreetlocksmith.com/uploads/1/3/0/3/130323181/664355.pdf
    • http://icdrugtesting.com/uploads/1/3/1/0/131070124/nezuluzibaxubol.pdf
    • http://berrywalnutfarmhouse.com/uploads/1/3/0/7/130739682/ff45b6529b5.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_off00004a2e.bin
731b83dd8e068811fe3d231fe517f5688619fa61c523c19e1a83c697ad64a08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2E 7116 bytes

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