Malicious PDF — malware analysis report

Static analysis result for SHA-256 954ec6363d45638f…

MALICIOUS

PDF

44.1 KB Created: 2020-05-03 21:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d15eb1751ec847bf61b168a215603c4a SHA-1: 87862c359d4abb36bd1969b8a9d166a83fa1cac1 SHA-256: 954ec6363d45638fea871ca8ba863b874b9aa8a0fe412620c66a29d69241c748
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The embedded URL and the document body text, though obfuscated, suggest a lure related to 'girl guide cookies'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://colorado-es.com/uploads/1/3/0/2/130291696/130291696.html#girl+guide+cookies+canada+gluten+free
    • http://movelikematt.com/uploads/1/3/0/3/130323762/44559e.pdf
    • http://wisconsinstringquartet.com/uploads/1/3/1/4/131453989/648817.pdf
    • http://tagumcitygym.com/uploads/1/3/0/5/130540874/wotikeduxi.pdf
    • http://realphone.org/uploads/1/3/0/9/130969532/palaka-voxunapega-mabepuzulanaxit-bebalivadorapij.pdf
    • http://pariscm.com/uploads/1/3/0/4/130435872/nuxolalaxiga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00007fed.bin
e185147a485051f2a5a41c3101635ce4a33db88b7d6acf8c19e123b8c2673be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FED 11336 bytes

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